Which safety practice should always be done at the beginning and the end of a microbiology lab

Hand Washing is one of the most important practices when it comes to avoid spreading germs due it helps removing microorganisms and potential pathogens that could be left on after regular activities which would alter the results of lab experiments, and also could easily remain after such lab experiments which could lead to the propagation of bacteria or harmful chemicals.

Explanation:

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

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