An introduced or invasive species can drive a natural species to extinction.

The main cause of the thinning ozone layer is global warming.

Acidic gasses are released into the air by combustion processes such as the burning of fossil fuels.

Biodiversity is important to humans because we are part of it and dependent on it for our own survival.

One of the values of biological magnification is its potential as a source of material that is beneficial to humans.

An increase in the earth's average temperature from the buildup of carbon dioxide and other gases in the atmosphere is called

Biodiversity is valuable in the biosphere because it

All of the following are threats to biodiversity EXCEPT

What would be the most likely effect of an increase in the use of CFC's?

Plants and animals that have migrated to places where they are not native are called

One of the greatest threats to biological diversity is

An endangered species is

Biodiversity is important to human society because it

Overexposure to UV radiation can

The number of different species in the biosphere is called

The major cause of ozone depletion is

The sum total of the genetically-based variety of living organisms in the biosphere is called

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