easy · Enhanced ACT science

A researcher observes that a population of desert plants has developed thicker waxy coatings on their leaves over many centuries.

This change is an example of:

  1. Natural selection, as the coating helps prevent water loss in a harsh climate.
  2. Osmosis, because the waxy coating is made of water that diffused from the roots.
  3. Homeostasis, as the plant individual changed its DNA to stay cool during the day.
  4. Mitosis, which allowed the leaf cells to divide more quickly under the hot sun.

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