What are inputs and outputs of a cell cycle ?

The inputs can be material, such as the silicon used in the computer chips in a phone, or energy, which is used, for example, to manufacture and operate a phone. Outputs can be usable products or wastes, which must be disposed or recycled. A life cycle analysis of a cell phone also includes an analysis of its individual parts.

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Limiting factors could be that there are too many predators, too many competitors for resources like food, water and shelter.

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