Evolution, for reasons that are not entirely obvious, has once more become a fashionable subject. Certainly a contributing factor is the wealth of data that has become available recently, enough in fact to impinge on our conceptual understanding of the subject. A great deal of attention has been given to information derived from protein sequencing (Dickerson and Geis, 1969) and polynucleotide structure (Darnell, 1979; Hori and Osawa, 1979). It also happens that much is now known in the lipid field, and the purpose of our review is to summarize the contributions made with this class of biochemical.
KeywordsConceptual Understanding Placental Mammal Cool Body Sophisticated Level Ecological Pressure
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