Climate is the biggest one, if it were anything else it would be like the type of ground (kind of like mountains or a valley.) Hope this helps!
Find a place in your house to put various lights.
Molecules such as glucose and amino acids can be absorbed from the digestive tract and a renal tubule by the process of facilitated diffusion, which involves a carrier protein that can transport a molecule across the cell membrane down its concentration gradient. The process involves a process of spontaneous passive transport of molecules or ions across a biological membrane via specific trans-membrane integral proteins.