DEVELOP. DIFFICULT

REAL

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__________________ from the University of California, Los Angeles, conducted a study of the sleep times of a broad range of animals. They discovered much variation. SCIENCE

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You may think it __________________ but some migrating birds can fly non-stop for up to 90 hours. POSSIBLE

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Pythons and bats are among the longest __________________ at over 18 hours a day. SLEEP

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Human babies need 16 hours and their health and intellectual __________________ depend on sleeping properly.

DEVELOP

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Most of us probably feel we need around eight hours sleep to function well.Some people have __________________ in getting enough sleep and this may lead to serious health problems.

DIFFICULT

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