According to Darwin's theory of natural selection, this characteristic helps a flounder blend in with gravel on the sea floor:

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Camouflage helps a flounder blend in with gravel on the sea floor. Darwin's theory of natural selection states that certain characteristics may give organisms a reproductive advantage. If a flounder is able to camouflage itself, it can hide from predators and avoid extinction.

According to Darwin's Theory of Natural Selection, This Characteristic Helps