What are the characteristics of endocytosis and exocytosis

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

Which hormone is used by both males and female?

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?