On a line graph, a flat, horizontal line means a. that the y variable is increasing. b. the y variable is leveling off in order to get to a decrease. c. there is a positive relationship between the two variables. d. that the y variable is staying the same.

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper