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Klijntje88 t1_j8ll15o wrote

It's a binding agent made from seaweed. It's basically a way to change a liquid into a solid, while retaining some of its properties like being see-through and the nutritional value. You can make a growing media specific for the desired micro-organism, and simply add Agar to solidify it, making it easier to work with

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sadetheruiner t1_j8ll9kh wrote

Completely on point! I was was going to say it as, “growing cultures need nutrients, and Petri dishes work better with a see through medium.” So yeah yours was better.

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