A species is fundamentally essential to an ecosystem; its loss changes the structure of the entire community, even though it may only represent a small portion of the population.
A) rivet
B) baseline
C) keystone
D) redundant
E) footprint
Correct Answer:
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Q19: Cutting down rain forests may result in
Q20: Forests influence local climates by
A) increasing evaporation
Q21: Comparison of the human ecological footprint to
Q22: Much of the tropical rain- forest land
Q23: An introduced species is "invasive" if it
A)
Q25: The largest threat to global biodiversity, as
Q26: Even when a natural ecosystem is not
Q27: Large mammals and birds require acres of
Q28: The ecological footprint of the human species
Q29: Overexploitation of many species has increased due
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