Three major factors determined the diversity of terrestrial plant life: the present geographical position as surrogate for climate, the history of climate, and horizontal and vertical tectonic movements at geological time scales. The result is a planet with very diverse marine and terrestrial systems (2.1) The climatic and edaphic conditions led to the development of taxonomically, morphologically and anatomically very diverse plant stems.
KeywordsResin Duct Sieve Plate Deciduous Broadleaf Forest Vertical Tectonic Movement Sieve Cell
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