Because the water didn't disappear, it just evaporated and now is water vapor in the air.
In 1923 when Hubble spotted a Cepheid variable star in what was called Andromoda Nebula and he was able to show that Andromoda was a million light years away ,which meant that it obviously wasn’t just a cloud of gas but a whole galaxy itself.And his discovery led to him becoming the most famous astronomer in the world just overnight ,because he brought us the fact that the “world” was bigger than we thought it was
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since for some reason I cant delete my answer I'm going to edit it.
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to maintain a constant body temperature
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The correct answer would be -provide detailed information about the research and drug and let the man decide if he wanted to withdraw from the research or take new drug.
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In this type of case where there is a drug that is in on going study or in clinic trail which is showing promising result, investigator should provide the client or subject a comprehensive account of the drug with is pro and cons and side effects.
He should discuss about the both currently available drug in market and ongoing research drug and let the man decide whether he want to be part of the research or withdraw from the research.