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, there is a concentration of carbon dioxide molecules inside the cell than outside the cell. as carbon dioxide molecules move by simple diffusion, molecules cross the cell membrane in. molecules move from inside the cell to the outside, until the concentration outside the cell is the concentration inside the cell. overall, the video shows

Explanation:

• For the first blank: As shown in the image, there are more purple (representing carbon dioxide) molecules inside the cell at the start. So, there is a higher concentration inside.
• For the second blank: In simple diffusion, molecules move randomly. But overall (net movement), they move down the concentration gradient.
• For the third blank: Diffusion continues until equilibrium (equal concentration on both sides) is reached.

Answer:

higher; both directions but overall (net movement is out); equal to