Repolarization occurs because multiple choice potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close. the extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value. the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level. more sodium ions diffuse into the cell than potassium ions diffuse out of it. the inactivation gates of the voltage-gated sodium ion channels begin to open and the diffusion of sodium ions decreases.

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Select the best answer for the question, ly 12. which of the following behaviors is not an inherited behavior?

How are fungi more like an animal? they have a cell wall. they are heterotrophs that absorb their food. they produce seeds and have membrane-bound nucleus. they use sunlight for photosynthesis.