Given a scientific passage and an answer, generate a question for the given answer.

Q: Passage: Pharyngeal slits : Pharyngeal slits are located in the pharynx. The pharynx is the tube that joins the mouth to the digestive and respiratory tracts. Answer: pharynx

A: What is the name of the tube that joins the mouth to the digestive and respiratory tracts?
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Q: Passage: Cynodonts probably gave rise to mammals about 200 million years ago. However, they are not considered to be mammals themselves. In fact, competition with early mammals may have led to their extinction. They went extinct sometime during the Jurassic or Cretaceous Period. Answer: mammals

A: Competition with what emerging animal group may have led to extinction of cynodonts about 200 million years ago?
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Q: Passage: Nutrients are substances that the body needs for energy, building materials, and control of body processes. Carbohydrates, proteins, lipids, and water are nutrients needed in relatively large amounts. Vitamins and minerals are nutrients needed in much smaller amounts. Answer: nutrients

A:
What are substances that the body needs for energy, building materials, and control of body processes?
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