Agriculture probably originated in
A) the Middle East.
B) South America.
C) Ethiopia.
D) Nigeria.
Answer: A
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In a deep-water marine food web that includes large populations of phytoplankton, zooplankton, and many species of carnivorous fish, what would happen if the populations of all species of phytoplankton decreased suddenly by 80% and stayed low for
several years? A) The fish and zooplankton populations would decrease. B) The zooplankton populations would decrease but not the fish populations. C) The zooplankton populations would increase but not the fish populations. D) The fish and zooplankton populations would increase.
For the reaction 2 N2(g) + 3 H2(g) ? 2 NH3(g) which of the following can be determined using only the coefficients of the balanced chemical equation?
A) the number of molecules of NH3 obtained if 4.2 mol of N2 react completely to form NH3 B) the weight of NH3 obtained if 4.2 mol of N2 react completely to form NH3 C) both a and b D) neither a nor b
If you hold the end of an iron rod over a fire, your hand will become warm because of heat being transferred by ____
a. convection b. advection c. conduction d. radiation
As the tide rises, water flows in toward the shore as the ebb tide
Indicate whether the statement is true or false