Final answer:
The nucleus stores genetic information, controls cell activities, and determines the identity of an organism.
Explanation:
The nucleus is a membrane-enclosed organelle that stores the genetic information and regulates the cell's activities. It contains the master set of instructions encoded in DNA, which determine how a cell will function, what it will become, and the individuality and identity of an organism.
The nucleus does not determine how long a cell will live; instead, factors like cellular damage, external conditions, and programmed cell death (apoptosis) influence a cell's lifespan. Cellular respiration, the process of releasing energy from food, occurs in mitochondria, not the nucleus.
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