Help Professor Fizzwick complete his laboratory safety manual by dragging the correct verb forms into the blanks.

As a general rule, if you heat this glowing green slime to 100 degrees, it turns completely invisible. However, if you drop your sandwich into the vat right now, the slime will mutate into a very angry monster!

As a general rule, if you heat this glowing green slime to 100 degrees, it turns completely invisible.

This is a zero conditional sentence because it describes a scientific fact or general truth. We use the present simple tense in both the "if" clause and the main clause.

However, if you drop your sandwich into the vat right now, the slime will mutate into a very angry monster!

This is a first conditional sentence because it describes a specific, real possibility in the future. We use the present simple tense in the "if" clause and "will" + base verb in the main clause.