No convincing fossil evidence exists for ____.
A. evolution
B. extinction
C. Earth’s age
D. catastrophism
E. uniformitarianism
Answer: D
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All of the following would lead to an increase in the force generated by a muscle contraction except:
A. increasing the rate at which calcium is pumped back into the sarcoplasmic reticulum. B. increasing the frequency of muscle stimulation by the motor nerve. C. increasing the number of muscle fibers activated. D. increasing the number of motor units activated. E. maximizing the number of cross-bridges formed during a contraction.
Erection occurs when
A. the spongy erectile tissue of the penis becomes engorged with blood. B. the veins flowing out of the penis vasoconstrict. C. the arteries of the penis vasodilate. D. nitric oxide is released. E. All of these events occur to promote an erection.
When planting seeds, why should you plant more seeds than you expect to grow?
a. Animals may eat some seeds. b. Some seeds may not germinate. c. The wind may disperse some seeds to an unsuitable environment. d. all of these
Insects have
a. simple eyes. b. ocelli. c. ciliary eyes. d. compound eyes. e. "camera" eyes