On both the eastern and western coasts of the USA, the subtidal zone contains very productive
a. seagrass meadows.
b. Laminaria seaweeds.
c. Ulva flats.
d. both a and b
e. both b and c
D
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Accessory pigments include molecules that reflect reds, oranges, and yellows. Leaves of many plants show these colors in the fall because
A. the cooler weather causes the plant to produce more of the accessory photosynthetic pigments. B. the chlorophyll in the leaves degrades as the plants shed leaves. C. the lessening of daylight as winter approaches causes the plant to produce more of the accessory photosynthetic pigments. D. plants produce more chlorophyll. E. All of the answer choices are correct.
According to the __________, the universe formed about 13 to 15 billion years ago and is still
expanding. Fill in the blank(s) with the appropriate word(s).
Humans still have body hair even though it is greatly reduced and serves little function. The hair is a(n)
A) analogous structure. B) vestigial structure. C) mutation. D) homologous structure. E) adaptation.
All of the following could be reasons why antimicrobic treatment fails except
A) A mixed infection where some of the pathogens are drug resistant. B) A disk diffusion test showing pathogen sensitivity to the antimicrobic. C) The inability of the drug to diffuse into the infected body compartment. D) Not completing the full course of treatment. E) Diminished gastrointestinal absorption due to an underlying condition or age.