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Brown bats sleep for 20 hours each day. how many hours per week are they awake? how many hours per year are they awake
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The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years
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Brown bats sleep for 20 hours each day. how many hours per week are they awake? how many hours per...
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