A keystone species is a species whose presence
A. Provides food for all other species in a community
B. Influences the population size of many other species in its community
C. Is always at the top of the trophic levels as a top predator
D. Is the main reason a community exists
E. Is an indicator of environmental health
Answer: B
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The source of energy for nuclear power plants is
A. nuclear fusion. B. breeder reactions. C. nuclear fission. D. nuclear combustion. E. hydrogen fission.
Which of these chemicals had the greatest reduction in emissions as a result of the Clean Air Acts?
A. lead (Pb) B. ozone C. sulfur dioxide D. nitrogen oxides
You feel uncomfortably warm on a muggy day because water molecules are
A. condensing in the air. B. evaporating from moist skin. C. condensing on your skin. D. preventing condensation on moist skin.
With their One-Child Policy, China hopes to stabilize their population at 1.5 billion around the year 2025
Indicate whether the statement is true or false