In the plasma membrane of neurons, a positive charge is found a- in the membrane b- out of the membrane c-neither inside or outside d-both inside and outside

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?