There are several points during the cell cycle when the cell will check to be sure everything is progressing normally, without mistakes, and confirm that the cell should continue to the next phase of the cycle. When do these "cell cycle checkpoints" occur?

These checkpoints occurs :

Explanation:

G1 checkpoint checks for :

Metaphase checkpoint (spinal assemply checkpoint) :

G2 Checkpoint :

answer: zinc is the substance which has a volume of 1.38 .

density is defined as the mass of an object per unit volume.

it can be calculated by dividing mass of a substance by its volume i.e.

si unit of density is kg per cubic meter and cgs unit of the same is gram per cubic centimeter.

now from the given data volume can be calculated by the formula .

hence, the volume of aluminium will be = which comes out to be 1.703 .

similarly, volume of zinc, chromium, and nickel will be 1.378 , 0.869 , and 0.356 respectively.