paolaviviana
20.08.2019 •
Biology
Human beings evolved during which geologic era? cenozoic mesozoic paleozoic precambria
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Ответ:
Ответ:
Jenner, a physician and scientist, noticed that milkmaids generally didn't develop smallpox, a disfiguring and sometimes deadly disease. He guessed it was because they sometimes caught cowpox, a related disease that only caused mild illness in people.