Most nutrients are absorbed across the epithelium of the
A. stomach.
B. esophagus.
C. small intestine.
D. colon.
E. large intestine.
Answer: C
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The Cambrian explosion refers to Earth's historical benchmark of life involving the
A. appearance of fossils for all major phyla of animals. B. origination of life, when the progenotes formed the first cells. C. All of the answer choices are correct. D. mass extinction of the nonavian dinosaurs. E. development of the first multicellular organisms.
The action spectrum of photosynthesis best matches the absorption spectrum of:
a. ATP. b. NADPH. c. carotenoids. d. carbohydrates. e. chlorophylls a and b
The organisms that most specifically utilize light energy to make organic molecules from inorganic molecules are
A. heterotrophs. B. photohemitrophs. C. photoautotrophs. D. photoheterotrophs. E. photoisotrophs.
Despite his insights, Erasmus Darwin came up short of a full-blown theory of evolution by natural selection because:
a. he failed to connect the struggle for existence to the evolutionary changes that would result from such a struggle. b. he believed in Lamarck's theory of the inheritance of acquired characteristics. c. Both of the above. d. None of the above.