By squeezing the food and pushing it towards the digestive juices in your stomach
Cells, metabolism, reproduction, homeostasis, heredity, etc.
Whattttttt? I can’t see anything
Simple Diffusion Across the Cell (Plasma) Membrane. The structure of the lipid bi-layer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.
Vitamin niacin ( vitamin B3)
