The systems are most responsible for providing cells with oxygen and removing the carbon dioxide. a) excretory and muscular b) digestive and excretory c) skeletal and respiratory eliminate d) circulatory and respiratory

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