What type of process is simple diffusion

Which of these is not a function of some membrane proteins ? a.allowing polar molecules to enter the cell b.recognizing other types of cells c.receiving messeges from other cells b.carrying messages to oher cells

The shift of a vehicle's weight around its center of gravity is known as

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity