__________ occurs when two species act as agents of selection upon one another. Fill in the blank(s) with the appropriate word(s)
Coevolution
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Purine bases, such as adenine and guanine, have ________ joined ring(s) for their structure, compared to pyrimidine bases, such as cytosine and thymine, that have ________ ring(s) in their structure.
Fill in the blank(s) with the appropriate word(s).
The amniotic egg was a key adaptation allowing vertebrates to make the transition to life on land where diffusion to/from a watery environment could not allow a developing embryo to meet its metabolic needs
Its three membranes are the _____, which surrounds the embryo in a watery sac; the _____, which sequesters metabolic waste away from the developing embryo; and the _____, which surrounds the embryo and other sacs. A. amnion; chorion; allantois B. chorion; amnion; allantois C. chorion; allantois; amnion D. amnion; allantois; chorion E. allantois; chorion; amnion
If humans reproduced by parthenogenesis:a
males would need to produce more sperm. b. external fertilization would be necessary. c. the number of females in the population would most likely increase. d. the population would not reproduce asexually. e. no gametes would be produced.
The smallest biological unit that can evolve is the ______.
a. phylum b. population c. individual d. species