What are the options? I’ll help if u send the choices:)
Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.
The tundra has little variation in temperatures
Keratin
Protecting the skin is one of its main responsibilities as a protein in epidermis.
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Answer is A.. hope this helps:)
