If scientists are studying the birds, crabs, and grass, but not the water or rocks in a salt marsh, what level of organization would they be studying? A. Community

B. Organism

C. Ecosystem

D. Population

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