A line of evidence NOT considered by Darwin in his development of the theory of natural selection is
A. the fossil record.
B. biogeography.
C. comparative biochemistry.
D. comparative anatomy.
Answer: C
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How do nastic movements differ from tropisms?
A. Nastic movements are slower than tropisms. B. Nastic movements only occur in the dark. C. Tropisms are directional responses to directional stimuli; nastic movements are the same regardless of the direction of the stimulus. D. Nastic movements happen after a stimulus, tropisms happen during a stimulus. E. Nastic movements are not reversible.
The tendency of certain forest species to occur in certain habitats (ridge tops or moist river bottoms, for example) is convincing evidence for the closed community concept.
a. true b. false
Which of the following statement(s) about the hydrologic cycle is (are) true?
A. Some water evaporates from land and from plants. B. Once water sinks into the ground, it is safe from human exploitation or pollution until it has rejoined the ocean. C. All water molecules that evaporate from the ocean precipitate on land and move by gravity through groundwater to the ocean again. D. Because this is a true cycle, it is impossible to run out of fresh water for human use. E. All of the choices are true.
The pentose phosphate pathway generates all the necessary precursors for nucleotide biosynthesis
Indicate whether the statement is true or false