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: Approximately how many weeks does the fetal period last? Answer: 30 weeks

A: The fetal period lasts approximately 30 weeks weeks.
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Q: Question: What is the ratio of solutes in a solution to a volume of solvent in a solution known as? Answer: osmolality

A: Osmolality is the ratio of solutes in a solution to a volume of solvent in a solution.
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Q: Question: What is the third gene of lac operon in addition to lacz and lacy? Answer: laca

A:
Laca is the third gene of lac operon in addition to lacz and lacy.
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