Which of the following is shown as a heavy blue line with triangles?
A) dry line
B) warm front
C) cold front
D) occluded front
Answer: C
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In coral reefs, clownfish live unharmed among the poisonous tentacles of sea anemones. The sea anemones protect the clownfish from predation, while the clownfish scare off predators, such as the butterfly fish, which would otherwise eat the anemones
The clownfish may also provide important nutrients to the anemones. This arrangement is an example of which symbiotic relationship? A) Parasitism B) Mutualism C) Commensalism D) Amensalism
The tail of a comma cloud is caused by a
A) cold front. B) warm front. C) occluded front. D) stationary front. E) dry slot.
Which of the following human threats to the ocean has resulted in making it more difficult for corals to build skeletons?
A) Acidification B) Aquaculture C) Increased ocean warming D) Overfishing E) Sea level rise
Afghanistan is important to the world drug trade primarily because
A) it produces about 90 percent of the world's opium. B) U.S. troops consume most of the opium grown there. C) of the inability to grow maize. D) of the proximity of the Russian market for illicit drugs. E) of the desire of local farmers to fund terrorist organizations.