Gravitational potential energy
<span>The ventricles are the part of the heart that are responsible for the pumping action to move blood throughout the body. Therefore, the muscles in the ventricles are much larger and thicker to do their job properly. The atrium only has to pump blood through an open valve (the tricuspid valve) into the right ventricle. There is much less resistance to this flow of blood so much less muscle is needed. </span>
Anything that is considered alive must exhibit ALL 7 characteristics of life. A virus may show some characteristics, but it does not show all, so therefore, its not alive.
Answer:
D: A density-independent factor.
Explanation:
An earthquake is a density-independent limiting factor
