Gravity is:
A) a force.
B) an acceleration.
C) an attraction between any two masses.
D) all of the above
Answer: D
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Although the polar regions radiate away more heat energy than they receive by insulation in the course of a year, what prevents them from becoming progressively colder each year?
A. circulation of heat by the atmosphere and oceans B. release of latent heat to the atmosphere when polar ice melts C. conduction of heat through the interior of the Earth D. concentration of Earth's magnetic field lines at the poles
The microorganisms that were a major component of the Cenozoic marine community were the
________, although some large forms have also been documented. Fill in the blank(s) with the appropriate word(s).
List the major rivers of the Russian region, their direction of flow, and the body of water where they terminate:
select all of the following that are true about protists
a. some protists are important autotrophs found in plankton b. protists are the most diverse group of eukaryotes c. protists are the most diverse group of eukaryotes d. all protists are unicellular e. some protists can produce toxins in deadly red tides and algal blooms f. products from algae are used as thickeners and stabilizers in food products, cosmetics, toothpaste, and other products