recon12759
18.02.2021 •
Biology
1. What were the conditions on the planet when life began?
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Ответ:
The early Earth had no ozone layer and was probably very hot. The early Earth also had no free oxygen. Without an oxygen atmosphere very few things could live on Earth. Anaerobic bacteria were probably the first living things on Earth.
Ответ:
control group
Explanation:
In manipulative studies, it is necessary to have an experimental group and a control group.