Carbon returns to the atmosphere:
A) As carbon dioxide
B) From respiration of plants
C) By the burning of fossil fuels
D) From respiration of animals
E) All are correct
Correct Answer:
Verified
Q18: A gradual change in a community's species
Q19: A _ makes up a small portion
Q20: The decline of the sea otter population
Q21: The "net primary productivity" is:
A)The amount of
Q22: An organism that can use energy and
Q24: Decomposers:
A)Obtain nutrients from detritus
B)Return organic molecules to
Q25: Nitrogen-fixing bacteria convert N2 into _.
A)Nitrates
B)Ammonia
C)Nitrites
D)Carbon dioxide
E)Methane
Q26: The _ cycle begins with the weathering
Q27: The type of succession that occurs in
Q28: A food chain is a series of
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