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Microbes were the first inhabitants of Earth. They are single-celled organisms, like bacteria, fungi, and protozoa. Microbes are still found just about everywhere today, thriving in boiling hot thermal springs
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The eons that make up 90% of Earth's history are the Precambrian eons, which consists of Hadean, Archean, and Proterozoic eons.
- Can change in the structure of chromosome affect in health and development . These changes can affect many genes along the chromosomes and disrupt the proteins made from those genes.
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