Once the threshold voltage triggers an action potential, what causes action potentials to be generated? a. lons channels are opened and positive ions diffuse into the cell.
b. lons channels are opened and negative ions diffuse into the cell.
c. lons channels are opened and positive ions diffuse out of the cell.
d. lons channels are opened and negative ions diffuse out of the cell.​

1. a tropical dry forest carries out more rapid nutrient cycling

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

it depends on how much it could carry.