Cells carry on specific functions that sustain life.
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Many basic functions of organisms occur in cells. Cells take in nutrients and energy to perform work, like making various molecules required by that cell or an organism.
Within the cell are specialized parts for the transport of materials, energy capture and release, protein building, waste disposal, information feedback and movement.
Every cell is covered by a membrane that controls what can enter and leave the cell.
Emphasis should be placed on the function and coordination of cell components, as well as on their roles in overall cell function.