The ecosystem that would most likely have a high net primary productivity is a
A. desert.
B. tropical rain forest.
C. boreal forest.
D. temperate forest.
E. tundra.
B. tropical rain forest.
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What are the two principle factors that lead to microevolution?
A. New genetic variation and gene duplication B. Horizontal gene transfer and evolutionary mechanisms C. New genetic variation and evolutionary mechanisms D. Natural selection and migration
The conducting cells in xylem are
A. sieve tube elements. B. tracheids and sieve tube elements. C. tracheids. D. tracheids and vessel elements. E. vessel elements.
Dizygotic twins are also called fraternal twins. Indicate whether the statement is true or false
The four most common elements in living organisms are
A) C, H, O, Fe. B) C, H, O, Na. C) C, H, O, N. D) C, N, O, Na.