Which of the following molecules is used by macrophages to kill pathogens?
A) NO
B) NO2
C) N2O
D) none of these
A
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As two objects lose mass, the attractive force toward each
A. decreases. B. increases. C. is not affected. D. becomes uncertain
A diagram of the flow of energy through an ecosystem resembles a pyramid. This explains why
A. not every organism at one level of the food chain is eaten by an organism at the next level of the food chain. B. animals need energy for maintenance. C. there is more grass than zebras, and more zebras than lions, on the African savanna. D. some ecosystems have a higher primary productivity than others.
Which of the following scenarios best describes the formation of hornfels?
A) Mudstones are metamorphosed by directed pressure. B) Granite is melted and recrystallized. C) Shales and mudstones are baked during contact metamorphism. D) Phyllite is altered by contact with hydrothermal fluids.
Explain why it is important to care about the survival of the endangered southern sea otters of California.
What will be an ideal response?