The molecules doesn't need energy to cross through.
The diffusion doesn't need protien, the molecules pass between phospholipids by passes protien. It moves smaller molecules. Facilitated need protien also hormone, and larger molecules.
I wish it makes sense.
The nucleus intructs cells to do their activities
Answer:
D I'm pretty sure i hope i'm right
The answer is B. Weathering has to occur before the sediments are eroded