Where do viruses come from

Viruses evolved from complex molecules of nucleic acid and proteins around the same time as the first cells appeared on Earth. A virus is a small, infectious agent that replicates only inside the living cells of an organism, they can infect all types of life, from plants to animals to microorganisms (including bacteria and archaea).

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1. law of superposition: when there are horizontal layers of rock. the layers at the top are the youngest.

2. law of uncomformity: where one layer is much younger than the previous one, therefore creating a gap in the time record.

3. inclusion: when there is a solid stone inside of another.

4. intrusion: a feature formed when a stone is filled with magma.

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