_____ became the dominant reef-builders in the Cenozoic seas
A)Rudists
B)Mollusks
C)Corals
D)Crinoids
E)Brachiopods
C
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Why is it harder to evaluate the toxicity of one chemical by itself compared to that chemical combined with another chemical?
What will be an ideal response?
Why would sand be deposited behind a small island to form a spit or tombolo?
A) The tidal affects are trivial behind the island, so the sand is not swept away. B) Waves refract around the island and the wave energy is dissipated on the island, allowing quiescent water behind, and sand drift to accumulate behind the island. C) The onshore current from one direction piles up sand here. D) The island protects the coast from rip currents, preserving the sand.
Harry Hess proposed that the ________.
A. magnetic poles wander B. magnetic field reverses C. the core is liquid D. continents drift E. sea floor moves
The Soviet Union exemplified a __________ in which economic decisions were made by the state.
a. corporate economy b. cooperative c. command economy d. market economy e. participatory economy