All of the following can be used as nutrients by the vast majority of marine photosynthesizers except ________.
A. CO2
B. PO43-
C. N2
D. NH4+
E. NO3-
Answer: C
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The three main factors that led to a rapid increase in the global human population are
A. available habitat, agriculture, and pesticides. B. agriculture, medicine, and media alerts. C. medicine, available habitat, and migration. D. available habitat, agriculture, and medicine. E. agriculture, medicine, and pesticides
The solar constant is
A) a consistent amount of energy received at the top of the atmosphere. B) the same for a sphere or for a circle. C) only about a quarter of all energy emitted by the sun. D) the same value for all planets, even Neptune.
Strong vertical wind shear inhibits the formation of severe thunderstorms
a. true b. false
Meanders in the Gulf Stream current can pinch off to form warm and cold core ________.
Fill in the blank(s) with the appropriate word(s).