The formations seen here are a result of A) repeated flooding.
B) alternate freezing and thawing.
C) acid rain dissolving soluble limestone bedrock.
D) sea water mixing with ground water to dissolve bedrock.

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:

cell regulation is conducted by special proteins.