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Are the layers of rock above and below the coal older or younger?

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?

Satellites orbit earth in the a) mesosphere b) troposphere c) stratosphere d) thermosphere