In global terms,the production of CO2 by respiration and its fixation by photosynthesis are balanced,but the balance has been shifted towards accumulation of CO2 by the increase in use of
A) meat products.
B) vegetable products.
C) fossil fuels.
D) all types of foods.
E) nuclear energy.
Correct Answer:
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Q12: With almost no exceptions,the nitrogen fixers are
A)beans.
B)green
Q27: The scarcity of which two elements limits
Q28: The primary consumers are
A)autotrophs.
B)carnivores.
C)decomposers.
D)detritivores.
E)herbivores.
Q31: A good average value for the amount
Q32: Factors that could determine productivity of an
Q34: The organisms that live on the refuse
Q35: Organisms depend on nutrient cycling.Nutrient cycling involves
Q36: Which of the following choices best describes
Q37: Energy enters the ecosystem mainly by the
Q38: Even though nitrogen constitutes 78% of Earth's
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