Which of the following statements describes an example of natural selection?

- A farmer breeds a certain cow that produces large quantities of milk in order to produce more cows with the same trait.

-An aloe vera plant possessing a trait for extra thick leaves survives a long drought in a desert, while an aloe vera plant that has thinner leaves does not.

-Owls sleep during the day, while many other animals sleep during the night.

-A species of corn is genetically modified to produce a natural insecticide, resulting in an increased harvest.

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