On what material are the bacteria grown in the petri dish?

Good morning,

Bacteria are everywhere, and since they reproduce rapidly they are easy to study with just a few simple materials. All you need are some petri dishes, agar, and sterile swabs or an inoculating needle. Agar is a gelatinous medium that provides nutrients and a stable, controlled environment for bacteria growth.

Have a good day! Hope this helps!

i would say it is