Hydrothermal vents ________
A) make the photic zone of ocean pelagic areas the most productive
B) create ocean currents
C) provide chemicals to symbiotic bacteria that support ecosystems at the ocean floor
D) occur in tropical areas at the ocean surface
E) are passageways for fish within coral reefs
C
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Which of the following is most soluble in water?
A) 2-butanone B) 1-hydroxy-2-butanone C) butanal D) 2,3-dihydroxybutanal
Stars having the same surface temperature radiate the same amount of energy per unit area
Indicate whether the statement is true or false
How are Danakil, South Africa and the Amazon Rainforest in Brazil connected
A. The Amazon Rainforest provides raw materials, such as timber and medicinal plants, to Danakil's population. B. Oxygen produced from the organisms in the Amazon Rainforest supplies oxygen to Danakil through weather and ocean systems. C. Sand from Danakil travels across the Atlantic Ocean to the Amazon Rainforest to provide the perfect plant fertilizer. D. Farmers living near the Amazon Rainforest are moving to Danakil in search of better agricultural livelihoods as rainforest acreage decreases.
Which one of these personalities was not a leader of the former Soviet Union
A. Gorbachev B. Khrushchev C. Solzhenitsyn D. Lenin