Producers are present at which trophic level?
A) first
B) second
C) third
D) fourth or higher
E) the level varies with different ecosystems
Correct Answer:
Verified
Q19: How does phosphorus enter the biological portion
Q20: By the process called _, an organism's
Q21: Which gas is increasing the most in
Q22: Primary production is the _.
A)rate of photosynthesis
B)rate
Q23: Producers take up _ from the atmosphere
Q25: The bottom or base of an energy
Q26: Detritus specifically includes _.
A)exclusively organic wastes
B)exclusively toxic
Q27: Most of the energy within an ecosystem
Q28: Burning of fossil fuels, use of synthetic
Q29: The amount of energy that flows through
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