Mutation is random because there is really no way of knowing whether a child will inherit it, whereas natural selection is predisposed in either parent.
(of an immature or stem cell) capable of giving rise to several different cell types.
I think it the answer could be a "steamy mixture of carbon dioxide and water vapor".
The most important thing is to try and extinguish a fire if a fire extinguisher is near. If not, they second most important thing is to rush out of the lab using the fire escape route and call the local fire department which will then handle the situation.
