Answer:
year light-colored frog dark-colored frog
1 6 2
2 4 4
3 2 6
6 0 8
question 1 - year 1
question 2 - dark-colored frogs increased while light-colored frogs decreased.
question 3 - dark-coloring is better suited for survival at year 3.
question 4 - dark color arose from mutation.
question 5 - yes, mutations arise randomly.