PLEAS HELP A student wants to prove that vinegar is the most effective way to remove stains from a whiteboard. To conduct a valid experiment, what should be the control group? DUE RIGHT NOW PLZ HELP!!! IM GONNA GET AN F

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