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When warm my house expands and when cold it contracts, I am vital to a certain type of pact. What am I?

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When warm my house expands and when cold it contracts, I am vital to a certain type of pact. What am I?
posted Mar 22, 2019 by Varuna Magar

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1 Answer

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Blood is the answer

answer Mar 22, 2019 by Hanifa Mammadov
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