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 boy pulls his hand away after touching a hot surface

Explanation:

INSTINCT MEANING: Instinct or innate behavior is the inherent inclination of a living organism towards a particular complex behavior.

The option "A dolphin swims through a hoop during an amusement park show" is absurd because dolphins are trained to do that which is not an instinct.

The option "A dog wags its tail when it hears a doorbell ring" is also not an Instinct.

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both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.