The energy for the water cycle originally comes from the

The energy for the water cycle originally comes from the sun.

Explanation:

The water cycle is driven by the energy from the sun. It provides energy for almost everything on Earth. Heat causes liquid and frozen water to evaporate into water vapor gas. Then it rises in the sky and form clouds which will eventually drop rain and snow. So this  energy drives the cycle by evaporating water from the rivers, lakes and oceans.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

voluntary muscles are controlled by the cerebellum.