The answer is C since heterotroph means they don't have a way of making food
You should wear safety goggles, make sure that your equipment is clean, and use the proper amount of chemicals(or other substance) as told
The answer is c in my opinion
A makes the most sense, though D could actually be an Ok reason, the other two aren't reasonable, a fire safety action? The door would be better open in a fire emergancy, it makes a quicker escape
