The symbiotic dinoflagellates that live in the tissues of coral polyps ____.?
A) ?provide carbon dioxide and phosphates for the polyps
B) ?feed on the tissues of the polyps and are dangerous parasites
C) ?are the main cause of coral bleaching, and are threatening the reefs of the world
D) ?provide additional nourishment and oxygen to the polyps through photosynthesi
D
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What is the second most abundant ion in seawater?
a. sodium b. chloride c. magnesium d. sulfate e. calcium
Formal procedures for participation run the risk of turning the participatory encounter into a mere exchange of interests. This, consequently, may:
a) thin solidarity. b) stifle creativity. c) encourage suspiciousness of those who violate norms. d) all of the above.
In 1970, the source of most of the airborne lead emissions in the U.S. was ________
A) paint B) gasoline C) water pipes D) pencil factories E) coal-burning power plants
A photovoltaic cell ________
A) makes electricity by having electrons flow from a negative to a positive layer B) is most efficiently used at high latitudes C) cannot be used without being tied to a power grid D) has iron making up the greatest percentage of its weight E) comes with a high price because of the high price of its fuel