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The largemouth bass is a species of freshwater fish. Scientists studied a bass population in a local pond over several generations and observed that the average size occurred only after a predator was introduced to the pond. Why did the bass change size?
What is Natural Selection
Some species of fish that lived near the coast developed a strange mutation: the ability to push themselves along in the mud and sand on the shore with their fins. This gave them access to food sources that no other fish could reach.
What is Natural Selection