Which of the following happens when cancer occurs? a. The control of the cell cycle is impaired.
b. Cells cannot pass the G1 checkpoint.
c. Apoptosis or programmed cell death takes place.
d. The cells can no longer enter the cell cycle.

the control of the cell cycle is impared

Explanation:

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.