Assessment of Biology Majors’ Versus Nonmajors’ Views on Evolution, Creationism, and Intelligent Design
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- Paz-y-Miño C., G. & Espinosa, A. Evo Edu Outreach (2009) 2: 75. doi:10.1007/s12052-008-0096-x
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The controversy around evolution, creationism, and intelligent design resides in a historical struggle between scientific knowledge and popular belief. Four hundred seventy-six students (biology majors n = 237, nonmajors n = 239) at a secular liberal arts private university in Northeastern United States responded to a five-question survey to assess their views about: (1) evolution, creationism, and intelligent design in the science class; (2) students’ attitudes toward evolution; (3) students’ position about the teaching of human evolution; (4) evolution in science exams; and (5) students’ willingness to discuss evolution openly. There were 60.6% of biology majors and 42% of nonmajors supported the exclusive teaching of evolution in the science class, while 45.3% of nonmajors and 32% of majors were willing to learn equally about evolution, creationism, and intelligent design (question 1); 70.5% of biology majors and 55.6% of nonmajors valued the factual explanations evolution provides about the origin of life and its place in the universe (question 2); 78% of the combined responders (majors plus nonmajors) preferred science courses where evolution is discussed comprehensively and humans are part of it (question 3); 69% of the combined responders (majors plus nonmajors) had no problem answering questions concerning evolution in science exams (question 4); 48.1% of biology majors and 26.8% of nonmajors accepted evolution and expressed it openly, but 18.2% of the former and 14.2% of the latter accepted evolution privately; 46% of nonmajors and 29.1% of biology majors were reluctant to comment on this topic (question 5). Combined open plus private acceptance of evolution within biology majors increased with seniority, from freshman (60.7%) to seniors (81%), presumably due to gradual exposure to upper-division biology courses with evolutionary content. College curricular/pedagogical reform should fortify evolution literacy at all education levels, particularly among nonbiologists.
KeywordsEvolution Creationism Intelligent design College education Assessment
The controversy around evolution, creationism, and intelligent design, which generates much debate in the USA (Petto and Godfrey 2007), resides in a historical struggle between scientific knowledge and popular belief. The theory of evolution proposes that the molecular and physiological processes responsible for the origin and diversification of life on Earth are the consequence of natural selection, mutations, gene flow, and genetic drift (Mayr 2001). Since the publication of The Origin of Species by Charles Darwin, in 1859, Darwinian evolution has been scrutinized experimentally; today, Darwinism is widely accepted by the scientific community. Creationism and its various forms, including theistic evolution, creation science, or young-earth creationism (Petto and Godfrey 2007), rely on the assumption that the universe and life were created by a Creator who guided the process. This faith-based view is not recognized by scientists as a rational explanation about the ways of the cosmos. Intelligent design (ID), a doctrine born in the 1980s, proposes that a Designer is responsible for the complexity in biological systems and that Darwinism cannot explain holistically the origin and evolution of the natural world, nor the intricate chemical assemblage of most organic structures (Forrest and Gross 2004; Young and Taner 2004; Miller 2007). In 2005, ID was exposed in court (Dover, Pennsylvania, Kitzmiller versus Dover Area School District) for violating the rules of science by “invoking and permitting supernatural causation” in matters of evolution and for “failing to gain acceptance in the scientific community” (Kitzmiller et al. versus Dover School District et al. 2005).
Thousands of articles and hundreds of books address the philosophical, political, social, and scientific components of the evolution/creationism/ID debate. Little is known, however, about how students’ views vary concerning the acceptance, learning, and teaching of evolution in college. Here, we explore students’ perspectives about: evolution, creationism, and intelligent design in the science class; students’ attitudes toward evolution; students’ position about the teaching of human evolution; evolution in science exams; and students’ willingness to discuss evolution openly. We compare/contrast the views of biology majors (BM) with those of nonmajors (NM) and document how majors’ acceptance of evolution increases with their academic level, from freshman to senior. By assessing students’ opinions concerning evolution, we hope to improve the approach with which evolution is taught and contribute to curricular/pedagogical reform for its effective teaching in college.
Profile of participants in the study (n = 476) in respect to the total number of full time students at Roger Williams University and the Biology Department (Roger Williams University Fact Book 2007–2008)
Students at RWU
Participants in study
We compared two groups, BM versus NM, and analyzed separately the categorical data generated in each of the five questions (i.e., questions 1, 2, 3, 4, or 5; choices A, B, C, D, or E). Data from questions 2, 4, and 5 (above) were organized in 2 × 5 contingency tables: BM, NM × A, B, C, D, E (chi-square tests, null hypotheses rejected at P value ≤ 0.05). Below, we refer to these groups as all-combined student responders: BM and NM in all five choices (i.e., total n = 476, biology majors n = 237, nonmajors n = 239). Because choices 1D, 1E and 3D, 3E had very few responders (<1.6%), we eliminated them and created 2 × 3 contingency tables for the remaining groups in each question, i.e., for question 1 or 3: BM, NM × A, B, C (chi-square tests, null hypotheses rejected at P value ≤ 0.05). Below, we refer to these groups as combined student responders: BM and NM in three choices (note: total value of n, as well as n for biology majors or nonmajors, varied depending on the number of responders). Pair-wise comparisons between BM and NM of the relevant groups were analyzed with Sign test two-tail, null hypotheses rejected at P value ≤ 0.05).
Because at Roger Williams University exposure to evolutionary theory increases with academic level, from basic to advance biology major courses (Table 1), while nonmajors attend a single core course with introductory evolutionary content (Core-101 Scientific Discoveries in Context, sophomore year), we analyzed responses of biology majors to questions 1–5 (above) as function of school year of enrollment (i.e., freshman, sophomore, junior, senior; chi-square tests of percentage values, null hypotheses rejected at P value ≤ 0.05).
Evolution, Creationism, and Intelligent Design in the Science Class
Evolution and Students’ Reaction to It
Students’ Position About the Teaching of Human Evolution
Evolution in Science Exams
Students’ Willingness to Discuss Evolution
Acceptance of evolution differs between biology majors and nonmajors: 60.6% of biology majors versus 42% of nonmajors supported the exclusive teaching of evolution in science classes, 70.5% of biology majors versus 55.6% of nonmajors valued the factual explanations evolution provides about the origin of life and its place in the universe, and 48% of biology majors versus 26.8% of nonmajors expressed their acceptance of evolution openly (Figs. 1a, 2a, and 5a, choice A). In contrast, 45.3% of nonmajors versus 32% of biology majors favored equal time in the science class to evolution, creationism, and intelligent design, and 46% of nonmajors versus 29.1% of biology majors preferred not to comment on their willingness to discuss evolution or creationism openly (Figs. 1a and 5a, choice B). The combined responses of students who accept evolution and express it openly plus those who accept evolution privately (Fig. 5a, choices A plus C) show that 66.3% of all biology majors versus 41% of all nonmajors accept evolution.
Acceptance of evolution within biology majors increased with their academic level, from the freshman to the senior year, e.g., support to the teaching of evolution in the science class (50.6% in freshman, 81.6% in seniors; Fig. 1b, choice A), appreciation for the factual explanations about the origin of life on Earth and its place in the universe (69.3% in freshman, 89.5% in seniors; Fig. 2b, choice A), or willingness to discuss evolution openly (44% in freshman, 64.8% in seniors; Fig. 5b, choice A). The combined responses of biology majors who accept evolution and express it openly plus those who accept evolution privately (Fig. 5b, choices A plus C) show that 60.7% of freshman and 81% of seniors accept evolution. Freshman biology majors alone showed higher overall acceptance of evolution than nonmajors (e.g., 50.6% of freshman biology majors versus 42% nonmajors supported the exclusive teaching of evolution; Fig. 1a,b, choice A; 69.3% of freshman biology majors versus 55.6% of nonmajors valued the factual explanations evolution provides about the origin of life and its place in the universe; Fig. 2a,b, choice A; 44% of freshman biology majors versus 26.8% of nonmajors expressed their acceptance of evolution openly; Fig. 5a,b, choice A), suggesting a precollege background in support of evolution, probably linked to household influence and/or high school science education. In some cases, freshman’s views were comparable to nonmajors’ (e.g., 41.2% of freshman biology majors versus 45% nonmajors favored equal time in the science class to evolution, creationism, and intelligent design; Fig. 1a,b, choice B), but the overall trend showed an increase in acceptance of evolution (Figs. 1b, 2b, and 5b, choice A) and a decrease in support of other alternatives (Figs. 1b, 2b, and 5b, choice B) from the freshman to the senior year. Gradual exposure to upper-division biology courses with evolutionary content might explain this trend (i.e., freshman—Introductory Biology; sophomore—Anatomy and Physiology, Animal Behavior, Conservation Biology; junior—Ichthyology, Marine Vertebrate Biology, Genetics; senior—Ecology, Phycology, Developmental Biology; Table 1). Note that at Roger Williams University, nonmajors attend a single core course, mainly during their sophomore year, with introductory evolutionary content (Core-101 Scientific Discoveries in Context; eight sections, 30 students/section; Table 1). We had no accurate way to assess their longitudinal range of views about evolution but suspect that nonmajors may not increase their acceptance of evolution chronologically as much as biology majors, considering that nonmajors never reached the freshman’s biology majors’ baseline support of evolution (data above). We point out, however, that nonmajors are willing to learn evolution: 55.6% of them appreciate factual explanations about the origin of life on Earth and its place in the universe (Fig. 2a, choice A), 72.7% prefer science courses where evolution is discussed comprehensively and humans are part of it (Fig. 3a, choice A), and 68.6% have no problem answering questions concerning evolution in science exams (Fig. 4a, choice A).
It is intriguing that 32% of biology majors favored equal time in the science class to evolution, creationism, and intelligent design (Fig. 1a, choice B). Further analysis of this group reveals that 41.2% of freshman biology majors agreed with this view, an opinion that drops to only 13.1% by the senior year (Fig. 1b, choice B). There is little knowledge, however, about ID among all-combined student responders (biology majors plus nonmajors): 48.5% have no opinion about it, 18% believe it is a scientific theory about the origin and evolution of life on Earth, 15.5% consider it religious doctrine consistent with creationism, 11% see it as not scientific but proposed to counter evolution based on false scientific claims, and 7% think it is a scientific alternative to evolution of equal scientific validity among scientists (chi-square = 2.227, df = 4, P value = 0.69, data not shown).
A small proportion of the students in this study object to evolutionary theory: 3.4% of biology majors and 6.3% of nonmajors feel uncomfortable hearing about evolution because it is in conflict with their faith and 1.2% of biology majors and 4.2% of nonmajors think that hearing about evolution makes them realize how wrong scientists are concerning explanations about the origin of life on Earth and the universe (Fig. 2a, choices D, E); 10% of both biology majors and nonmajors prefer science courses where plant and animal evolution is discussed but not human evolution (Fig. 3a, choice B); 5.9% of biology majors and 8.4% of nonmajors prefer not to answer questions concerning evolution in science exams; and 0.4% of biology majors and 2.1% of nonmajors never answer such questions (Fig. 4a, choices D, E).
These results may represent a general tendency among secular liberal arts private colleges in Northeastern United States, particularly those similar to Roger Williams University (middle/upper-middle income population); more than 90% of the students at this institution are native to New England (77.3%) and the East Coast of the US (18.9%; Table 1). Because public support to science correlates positively to level of schooling and income (National Science Foundation 2006), local and regional differential acceptance of evolution should be expected if similar assessments were conducted at public or religious institutions.
Objections to teaching evolution in the science class presumably come from misinformed adults, rather than college students. In fact, acceptance of the theory of evolution in the USA increases with level of education, from 20% in high school to 52% and 65% among college- or postgraduates, respectively (Brumfield 2005); our results (70.5% biology majors (Fig. 2a choice A); 66.3% biology majors (Fig. 5a choices A plus C)) surpass the latter. Adults who, for example, believe that humans were designed in the present form within the last 10,000 years coincide with the views of the least educated population of adolescents between the ages 13 and 17 (Brumfield 2005).
The literature illustrates this further and helps us understand the transition of the evolution/creationism controversy from high school to college. Because parents and some community leaders influence high school policies, teachers avoid conflicts with them by weakening the science curriculum. To comply with parents’ demands and student’s curiosity for catchy jargon, such as “intelligent design,” 43% of high school teachers are willing to dedicate “equal time” to science and ID (National Science Foundation 2006), and 30% and 31% admit to having omitted evolution from their lessons or included nonscientific alternatives to evolution in their classes due to pressure, respectively (US National Science Teachers Association 2005). As a result, students arrive at college with weak science backgrounds; our data on nonmajors’ acceptance of evolution (41%; Fig. 5a, choices A plus C) demonstrates that.
Does assessing student acceptance of evolution matter? Because college curriculum development is conceptualized by institutional committees (National Science Foundation 2006), influenced by public opinion (Petto and Godfrey 2007; The Gallup Poll 2007), it is crucial to understand students’ perception of science and tendency of acceptance of scientific principles. The major implication of our findings, for the purpose of curricular/pedagogical reform, is that evolution (the course, the core theme of all sciences, the centerpiece of all rational explanations about the natural world and the cosmos) should be required at and integrated into all educational levels. Evolutionary theory should be offered widely and taught without distinction between biology majors and nonmajors as part of their science literacy. Our study demonstrates that students can be, and are, enthusiastic about learning factual explanations about the origin and diversification of life, including humans, and that contact with science education, particularly biology, determines their acceptance of evolutionary theory. Students exposed to evolution in the classroom accept it, while those deprived of it can adopt nonscientific interpretations about the reality of the universe in which they live. We are confident that comprehensive science education, particularly directed at nonbiology majors, can correct this anomaly, but public and institutional support are crucial to guarantee such outcome. Outreach education programs for nontraditional students, school teachers, and the public are fundamental to integrate evolution into our society’s culture. Although the majority of students in our survey seem receptive to learning about evolution, a possible trend at sister secular liberal arts private institutions in Northeastern United States, we must continue assessing how their views evolve with time, particularly now that objections to evolutionary theory reappear with vigor.
We consider it important to improve the approach with which evolution should be taught. The following tips have helped us communicate evolutionary theory to our students and motivate them to pursue careers in the sciences: (1) be as sensitive to students’ faith preferences as to other types of diversity in the classroom, such as cultural backgrounds and gender orientation; (2) discuss evolution as scientific fact and in a comparative manner across taxa, always including humans as part of nature (Gould 2002; Dawkins 2004), i.e., humans as vertebrates, mammals, primates, apes; (3) teach human evolution comprehensively from the molecular, morphological, and cognitive perspectives (Lewin and Foley 2004; Stringer and Andrews 2005; McKee et al. 2005); (4) emphasize that microevolution (change in the genetic makeup of populations) and macroevolution (speciation and the development of major processes and patterns in nature) are interdependent and that one cannot occur without the other (Mayr 2001); (5) remark on the molecular unity of life and link all organisms to a common ancestor by using phylogenetic analyses based on DNA/RNA (Lecointre and Le Guyader 2007); (6) introduce students to the concepts natural selection, mutations, gene flow, and genetic drift by running numeric simulations in laboratory settings (Simulations on Bird Population Biology or Simulations on Neanderthal Population Genetics, available from the authors upon request); (7) take advantage of the students’ current fascination with fossils, particularly dinosaurs and hominids, and use them to illustrate adaptive radiation, speciation, and extinctions of formerly successful taxa (Human Evolution Lab: Using Fossil Replicas, available from the authors); (8) conduct field courses in exemplar environments where geologic time can be appreciated at large scale, i.e., Grand Canyon, Hawaiian, or Galapagos archipelagos (Evolution on Islands: Using the Galapagos Archipelago as a Model, syllabus available from the authors); (9) discuss novel examples of micro- and macroevolution currently at work, e.g., tuberculosis resistance to antibiotics (Ernst et al. 2007), beak evolution in Darwin’s finches (Grant and Grant 2006); and (10) leave the students with the idea that evolution is a gradual process by which the universe changes and that it includes the origin of life, its diversification, and the synergistic phenomena resulting from the interaction between life and the environment.
We thank the students at Roger Williams University for participating in this study; Kerri Warren, Brian Wysor, Dale Leavitt, David Taylor, Harold Pomeroy, Loren Byrne, Marcie Marston, Paul Webb, Scott Rutherford, Sean Colin, Timothy Scott, Tom Sorger, Anthony Viola, Christopher Laperle, and Mary Rapien distributed the surveys to the students. Patricia Kennedy facilitated the administrative and logistics aspects of the study. Gregory Rogers provided the raw data used to build Table 1. The Human Subject Review Board at Roger Williams University approved the protocol. Two reviewers and a guest editor provided comments that helped us improve the manuscript.