Given a statement, generate a question such that the answer is contained in that statement.

Q: a directory of the types of hemoglobin in the family tree is a useful tool for studying inheritance patterns

A: What is a useful tool for studying inheritance patterns?
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Q: the amount of space an object contains can be used to describe the dimensions of that object

A: What does the amount of space an object contains can be used to describe?
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Q: respiration is essential

A:
What is essential?
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