Which of the following statements is true? Granite is formed when rock pieces are cemented together by dissolved chemicals. The crust below continents is thinner than crust below oceans. Marble is a type of igneous rock. Aristotle used Earth's shadow during a lunar eclipse to prove the world was not flat.

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