Which statement is true about natural selection and evolution?

a. evolution is the mechanism by which natural selection occurs.

b. natural selection and evolution both show change over time.

c. evolution and natural selection occur separately in an ecosystem.

B. Natural selection and Evolution both show the change over time in the survival of a specific organism. Natural Selection chooses traits that correspond the best with the ecosystem, while evolution gradually changes the species as a whole to cope with the surroundings.

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