1. What's the difference between an ionic bond and a covalent bond? 2. An electric current is trying to move through an atom. How do protons and electrons impact the movement of electricity?

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?