Natural Selection

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Three types of natural selection. Getty/Encyclopaedia Britannica/UIG

Definition:

Individuals with adaptations that are suited to their environments will live long enough to breed and pass down those desirable traits to their offspring.

Also called "survival of the fittest", natural selection is the idea that a species will adapt to its environment and over time pass down those adaptations to their offspring. Individuals that don't adapt will die off before breeding and those unfavorable traits will not be passed on.

Eventually, only the desired traits will survive in the population.

Examples:

Darwin studied beak length in the Galapagos Islands and how the different beaks helped the finches survive based on the types of food they ate.