When a rock first formed it contained 8 milligrams of potassium-40. How much potassium-40 would remain after three half-lives a. 1 milligram
b. 2 milligrams
c. 3 milligrams
d. 4 milligrams

g1

choices:

a. g2. b. g1. c. m

cell division has two checkpoints namely, g1

checkpoint and spindle assembly checkpoint. the checkpoint which determines if

division has properly occurred is the g1 checkpoint. at this point, is a damage

in the dna is detected or  the has not reach the optimum size, the cell is

stopped in g1 and is not allowed to proceed to further process.

source:

answerbacterium;