Which summary best explains the mechanisms that control the cell cycle in multicellular
organisms?
the type of dna in each cell controls the rate of the cell cycle and the specific type of cells
formed
the size of the cell determines the number of cells that will be produced from each cycle.
internal and external signals regulate the progression of the cell cycle at various critical
checkpoints
hormones signal the start of the cell cycle, and dna determines how the cell differentiates.

The correct answer is internal and external signals regulate the progression of the cell cycle at various critical check points.

Explanation:

The cyclic event that helps to prepare the cell for division is termed as cell cycle.Cell cycle are regulated by various internal and external factors which regulates the passage of cell through various critical check point.

 For example Maturation promoting factor helps in the progression of frog egg oocytes cells from G2 to M phase.

    G1 cyclin CDK helps in the passage of cell from G1 to S phase.

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a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves