In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

Q: Question: When substances pass through the cell membrane without needing any energy what is it called? Answer: passive transport

A: When substances pass through the cell membrane without needing any energy, it is called passive transport.
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Q: Question: Which has a higher metabolic rate, a mouse or an elephant? Answer: mouse

A: Mouse has a higher metabolic rate, a mouse or an elephant.
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Q: Question: What should a pregnant woman avoid while pregnant? Answer: toxic substances

A:
A pregnant woman should avoid toxic substances while pregnant.
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