Which of the following groups is represented today by a single species?
A) Conifers B) Liverworts C) Ginkgos D) Bryophytes E) Cycads
C
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Which of the following pairs is mismatched?
a. microfilaments : actin b. cell membrane : phospholipid bilayer c. plant cell wall : cellulose d. chromosome : DNA e. intermediate filaments : tubulin
Which one of the following is absolutely necessary for diffusion to occur?
a. a living cell b. a phospholipid bilayer c. a selectively permeable membrane d. a concentration gradient e. a solution
Dizygotic twins are no more or less genetically similar than are other pairs of ____________________.Fill in the blank(s) with the appropriate word(s)
Due to reproductive isolation, a new species of weaver bird is evolving. Is it likely to use a social or solitary nesting strategy?
A. It depends on how many similar species it is competing with. B. It depends on whether it lives in the forest or the open savanna. C. It depends on whether it lives in near water or near the desert. D. It depends on how many eggs it lays.