Many new groups of organisms evolved in a relatively short time in an event called the

Atown is built on the banks of a small lake on the edge of a desert. after some time, the townspeople discover that water from the lake has become too polluted to use. describe one way that the lake may have been contaminated by the actions of the townspeople, and explain how the townspeople can remediate this problem.

Explain why components that are naturally found in air can be considered air pollutants.

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