Nitrogen fixation _______.a.is the process where nitrogen is converted to a usable formb.is accomplished by plants when they break down soilc.occurs as a result of photosynthesisd.none of the above
Why does the government not do more to regulate nonpoint source pollution?a.Nonpoint source pollution is less harmful to the environment, so it does not need to be regulated.b.Point source pollution is more common than nonpoint source pollution, so it is more regulated.c.Nonpoint source pollution is caused solely by animals, which are not possible to regulate.d.Nonpoint source pollution is difficult to regulate, because its source is difficult to track.
How much of the Earth’s water is usable as a freshwater resource?a.75%b.3%c.100%d.25%
Where are rain gauges located?a.on or near the groundb.one meter above the groundc.on weather balloonsd.on satellites
It is believed the major reason for the decline in amphibian species is _______.a.death through diseaseb.changing reproductive habitsc.mutationd.climate change
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