Before an action potential begins, the fluid outside an axon's membrane has ions; the fluid inside has ions.

Did the vinegar diffuse all the way to the center of any of the cubes? if so, which ones? what does this tell you about surface area-to-volume ratio and the diffusion rate?

As the earth formed, the force of gravity increased due to increased mass. what effect did this increased gravity have on the forming planet?

Organisms may contain up to five levels of organization within their bodies. which level of organization is shown by the liver? a. tissue b. organ c. organism d. organ system