Respuesta :
B. Simple Diffusion. Because the substances are small and uncharged, they can passively diffuse through the membrane without the help of ATP or transport molecules.
Answer;
Simple diffusion
Small, uncharged substances enter and leave the cell membrane through the process of simple diffusion.
Explanation;
Simple diffusion involves the movement of substances through a membrane without the aid of an intermediary such as a integral membrane protein.
The force of diffusion drives the substance from one side of the membrane to the other.
In the cell, examples of molecules that can use simple diffusion to travel in and out of the cell membrane are water, oxygen, carbon dioxide, ethanol and urea
