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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.

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

In the following diagram, four different index fossils are labeled: which of the labeled fossils comes from the oldest organism? a b c d