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storchak [24]
3 years ago
10

External signal that controls the cell cycle

Biology
2 answers:
Nesterboy [21]3 years ago
7 0

Answer:

physical and chemical signals

Explanation:

zheka24 [161]3 years ago
4 0

Answer:

External factors include physical and chemical signals. Growth factors are proteins that stimulate cell division. – Most mammal cells form a single layer in a culture dish and stop dividing once they touch other cells.

Explanation:

From Google

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