Variation means difference in genetic makeup between individuals within a specie.
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the energy source is primarily the sun, and it drives the cycle by evaporating water from the oceans, lakes, rivers, and even the soil.
Answer:
Hypothalamus
Explanation:
The hypothalamus is involved in different daily activities like eating or drinking, in the control of the body's temperature and energy maintenance, and in the process of memorizing and in stress control. It also modulates the endocrine system through its connections with the pituitary gland.
