Animals that are hermaphroditic usually
a. fertilize their own eggs.
b. cross-fertilize.
c. donate eggs to other individuals.
d. cannot reproduce sexually.
e. fit all of these descriptions.
Answer: b
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Humans are capable of synthesizing 12 of the 20 naturally-occurring amino acids without having to obtain them from our diets
A. true B. false
Which naturally-occurring plant hormone has a major role in the phototropic response of plants?
A. auxin B. gibberellin C. abscisic acid D. ethylene E. 2, 4-D
Fossil evidence shows that giraffes living 1000 years ago had much shorter necks than the giraffes seen today. Which
statement best explains this observation? a. The two groups of giraffes are not related. b. The two groups of giraffes arose as a result of convergent evolution. c. The difference in neck length is evidence for homoplastic inheritance. d. The two groups of giraffes were located in different geographical locations. e. The giraffes acquired longer necks through the continuing process of natural selection.
Given the diversity in protist ultrastructure and molecular data, biologists regard the protists as a(n) ____ group,
meaning that some are descendants of a common eukaryote ancestor. a. monophyletic b. paraphyletic c. polyphyletic d. homoplastic e. homologous