In the dessert lived jack rabbits. They were happy little jack rabbits. They varied in fur and color. Some are ark brown and some are light brown.
One day some hungry wolves came along running.
Feed Me Now!!!
I can eat anything.
Since the dessert had sand the lighter colored rabbits blended in and the darker rabbits couldn't so they got caught.
I got you now.
The light rabbits blended in with sand, environment so they adapted better and camouflaged. They are most likely to survive. They will live and reproduce and pass their genes on to next generation.
Anybody seen my friend.
Soon, there as a population shift. The dark rabbits decreased until there are none left. The light rabbits lived and their population increased. Survival of the fittest was shown the lighter rabbits lived and their population increased they adapted to the environment.
Eventually, the dark rabbits died because the fox's ate them all because they couldn't adapt as well as the light rabbits. The foxes ate all the dark rabbits then moved to another place to find food since the lighter ones adapted better they lived.