Erection occurs when
A. nitric oxide is released.
B. the spongy erectile tissue of the penis becomes engorged with blood.
C. the arteries of the penis vasodilate.
D. the veins flowing out of the penis vasoconstrict.
E. All of these events occur to promote an erection.
Answer: E
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Citing the dangers of rabies-transmission by local populations of bats, a farming community begins a campaign to trap and kill the winged mammals on a large scale. Shortly thereafter, cornfields begin showing substantial and increasing damage to crops. What is the most likely explanation?
a. Installing bat traps caused disruptions to the local water table. b. Infrasonic cries of trapped bats cause corn plants to suffer stress reactions. c. Pests feeding on corn have multiplied without natural predators. d. Bats feed on damaged corn, leaving more room for healthy plants.
The autonomic subdivision consists specifically of:
a. central and peripheral nerves b. parasympathetic and sympathetic nerves c. somatic and involuntary nerves d. brain and spinal cord e. spinal and cranial nerves
The letter “C” in the above figure represents
a. the root nodules. b. the primary root. c. the primary leaf. d. the cotyledons. e. none of these.
Reproductive success is measured by the:a
body mass of an organism. b. number of viable offspring. c. longevity of an organism. d. population size. e. amount of food it eats