Question

carbon dioxide passively diffuses across cell membranes down its concentration gradient. this means that, overall, the molecules move from an area of higher concentration to an area of lower concentration. an overall directional movement is known as net movement. this video shows carbon dioxide crossing the cell membrane by simple diffusion. complete the paragraph. at the start of the video, the concentration of carbon dioxide molecules outside the cell is than inside the cell. by simple diffusion, carbon dioxide molecules cross the cell membrane in. molecules move from outside the cell to the inside. eventually, the concentration outside the cell is the concentration inside the cell. overall, the video shows that carbon dioxide has a net movement its concentration gradient.

Explanation:

Diffusion is from high - to low - concentration. Equilibrium is reached when concentrations equalize.

Answer:

1. lower
2. both directions
3. Some
4. equal to
5. down