B. Exchanged during normal breathing
Fungus!
animals eat things to get their nutrients as opposed to absorption. fungi do not photosynthesize.
Answer:
Diffusion is very important to organisms because it's the method by which useful molecules enter the body cells and waste products are removed. Digested food molecules (amino acids, glucose) move down a degree gradient from the intestine to the blood.
Explanation:
Air pressure is caused by the air molecules around us. Air particles are always in random and continuos motion, bombarding each other in random direction. As air particles collide they create pressure.