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Michaela Strachan observes a variety of fish and how they have evolved to become better camouflaged to suit their environment. Animals that are not well camouflaged are more likely to be eaten as prey. Mutations are changes in genes that produce a beneficial or harmful trait. After many generations the better camouflaged offspring will thrive and reproduce more. Michaela models selection pressure by predators with a game involving sweets and salad.