The land mass labeled 1 in Figure 18-2 is called:
a. Eurasia.
b. Laurasia.
c. Antarctica.
d. Gondwana.
e. Pangea.
B
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What will be an ideal response?
ACTH
a. is secreted by the posterior pituitary. b. has target cells in the autonomic nervous system. c. has target cells in the adrenal cortex. d. has target cells in the adrenal medulla. e. initiates the autoimmune response.
Ergot, a fungus, contains a hallucinogenic drug that binds to serotonin receptors. The natural drug is most similar to ________
A) mescaline B) methamphetamine C) LSD D) morphine
Oligotrophic lakes are characterized by
A) low oxygen concentrations. B) dense "blooms" of algae. C) low nutrient levels, and clear water with deep penetration of light. D) high nutrient levels, murky water, and shallow penetration of light. E) the largest number and diversity of organisms.