That would be erosion. I know this because i spent years studying rocks and had straight passed all of it. Hope this helps. ;)
A because yeast do alcholic fermatation in bread when you bake and some bacterias prokayotes live off it.
• Wear safety goggles
• Hold the test tube at an angle. Point the test tube away from yourself and all other people. Heat the test tube over the bunsen burner gently from the top of the substance being heated, and always.
hope this helps x
