What characteristic do the nucleus, the mitochondria, and the vacuoles of animal cells have in common?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

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

All other things being equal the size of a population will decrease if