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environment
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environment: Related Content

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Learn about the hygiene hypothesis and understand how exposure to certain germs help develop a child's immunity
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Key People

Ishihara Shintarō
Japanese writer and politician
Julia Carabias Lillo
Mexican ecologist and environmentalist
Barry Commoner
Barry Commoner
American biologist

Related Quizzes and Features

Quiz
greylag. Flock of Greylag geese during their winter migration at Bosque del Apache National Refugee, New Mexico. greylag goose (Anser anser)
Biology Bonanza