The rDNA sequences of which organisms branch nearest the root of the archaean tree? Choose one: A. Crenarchaeota B. Euryarchaeota C. Thaumarchaeota D. Ancient Archaeal Group

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