The best scientific explanation for differences in structure, function, and behavior found in different species or organisms is provided by
a. carbohydrate electrophoresis
b. population chromatography
c. the theory of carrying capacity
d. the theory of evolution
Answer: d. the theory of evolution
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The development of cauliflower and broccoli from wild cabbage is partly explained by
A. a mutation in a flower development gene that was artificially selected by humans. B. a mutation in a leaf development gene that evolved by natural selection. C. homoplastic convergence of two plant lineages. D. gene duplication and divergence, leading to novel functions. E. a mutation in a Hox gene that was artificially selected by humans.
In the flower diagram shown above, the item labeled "8" is a(n)
a. ovule. b. stigma. c. sepal. d. anther. e. style.
In a flower, the mature male gametophyte is
a(an)
a. pollen grain. b. germinated pollen grain. c. ovule. d. microspore. e. sperm cell
The minimum amount of energy needed to get a chemical reaction started is called the ____ energy
a. activation b. reaction c. enzymatic d. chemical e. triggering