Dinosaurs are not alive today because they

A) evolved too quickly in response to a changing environment.
B) did not possess the genetic material that beneficial mutations act on.
C) did not evolve fast enough to keep up with rapid environmental change.
D) evolved adaptations that were beneficial in their constant, unchanging environment.


C

Biology & Microbiology

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Indicate whether the statement is true or false

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The bony or cartilaginous cranium in chordates is adaptive because it

A. develops into the postanal tail. B. protects the brain. C. allows movement, as a lightweight exoskeleton structure. D. replaces the notochord in most chordates. E. forms the vertebrae.

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Haldane pointed out that if he received a certain allele, the chance that one of his brothers would receive that allele would be 

A. 100%. B. 50%. C. 10%. D. random. E. 0%.

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The most abundant mineralocorticoid is

a. epinephrine. b. norepinephrine. c. aldosterone. d. cortisol. e. estrogen.

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