Which definition best describes an acid?

What are the proteins in connectivity tissues of your foot examples of?

Which organism in this food web is an omnivore?coati

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?