How is the Dingell-Johnson act different from the Pittman-Robertson act?

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on

A. convection currents in the mantle.is the correct answer

The answer is centrioles forming happens in animal cell mitosis but doesn't happen in plant cell mitosis.

Since the black bears eat both fruit and meat that makes them an omnivore