Which is an example of an instinct? a rabbit hides when it observes a predator. a dog wags its tail when it hears a doorbell ring. a boy pulls his hand away after touching a hot surface. a dolphin swims through a hoop during an amusement park show.

 A rabbit hides when it observes a predator.

Explanation:

An instinct is an inborn pattern of activity or behavior shown by the animal. It is peculiar and specific for a biological species. Among the options given, A rabbit hides when it observes a predator. is the correct option. As it can be define as an innate behavior because to save it's life becomes the first priority of any animal in nature. If an animal detects danger it tries it's best to save itself.

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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.