Answer:
membrane proteins
In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers
Explanation:
Because of different DNA handed down from their ancestors, and different environmental effects.
There are two steps: condensation and precipitation. Condensation - First, the water vapor condenses. Condensation is the change of water from gas form to liquid form. When water vapor in the atmosphere loses heat and cools down, condensation happens.
Biotic is living things so it's either A or C I'm good at Biology I have a 100%