All of Earth that is inhabited by life is called the

To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.

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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.

Changes in Earth's atmospheric carbon dioxide levels over geological time.

Cataract extraction. The procedure involves a surgical removal of a cataract lens and its replacemen

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People whose behaviors violate norms are often called mentally ill. “Why else would they do such ...

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The nucleus is bounded by a double membrane called the nuclear envelope

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