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there are some lizards that are a similar color to the environment around them and others that are a darker green color and stand out more.
the struggle for survival is that they have to face things like predators. In this case, predators for lizards would be different types of birds.
The ones that are colored closer to the surrounding environment are better off than the ones that are a darker green color. They tend to stand out more and get eaten by predators.
There is an increase in the light brown lizards and a decrease in the dark green lizard types. The ones surviving are able to reproduce and make more lizards with the favored trait.
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