Cells, tissues, organs, organ systems, organisms
Commercially prepared processed foods
Cell divison is necessary to replace cells that are worn and aging. Cells do not have an indefinite life span. Fo example, the life span of a red blood cell is about 120 days.
The answer activation-synthesis. The theory is pegged on the high brain activity in the brain stem during deep sleep (rapid-eye-movement phase). The activity in this region is different during sleep and wake states. According to the theory, the primary consciousness is activated,
and expanded into secondary consciousness, during dreaming, while the body is an atonic state.
Answer:
Nucleus
Explanation:
every cell has a nucleus kind of like a factory has a ceo, does this make sense to you?