Why do most macroinvertebrates need clean water Sensitive to pollution
Cannot see in dirty water
They are not sensitive to pollution

Nucleic acid certain protein cell membranes certain carbohydrates

Which describes the changes in the earths motion?

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?