Which change is chemical? A) Water boiling: solid water becoming gaseous water
B) Water freezing: liquid water becoming solid water
C) Water evaporating: liquid water becoming gaseous water
D) Water undergoing electrolysis: liquid water becoming oxygen and hydrogen molecules

option D is correct answer I think

D is your answer.

The reason why is because D is the water changing its own chemical composition (water to hydrogen and oxogen). all of the others are it simply put changing its state (solid liquid gass etc.)

Wbob1314

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:

i'd say that the moon rock is about 2.2 billion years old.