Does history have to be linear? What are the advantages of thinking about time as being in a straight line? What are the problems of this approach

What are the main functions of the human skeleton? a exchange of gases b support and movement c sensing the environment d digestion and excretion

According to the nebular theory, the planets formed from a process called . after our protosun formed, remaining dust and gas from the nebula collided, combined, and gravitated together to form the planets.

The torque output of an engine is usually measured in the units of a rpm b bhp c foot pounds d feet per pound