There is variation within a species of ants. There are an equal number of tan-colored and green-colored ants.
There is competition for survival. Since the environment is tan, the tan ants are able to blend in while the green ants stand out. The green is more visible, allowing predators to catch them easier. The tan becomes more accessible, passing on the tan-color gene to their offspring. 
The tan ants become more abundant because they had a better chance of survival. There are fewer green ants in the population. The tan ants are considered the 'fittest' in this sandy environment. The environment gradually grows grass.
Over a series of generations, the environment changes. 
As the grass proliferates, more green ants survive and the tan ants become more visible to predators. The population of green ants increases and they pass the green-color gene onto their offspring.
There are more green ants than tan ants. In the new grass-filled environment, the green ants are considered the 'fittest' (best adapted). 
By: Hailey Nguyen
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