Why do you think it’s useful for scientists to classify matter? In other words, why do you think scientists need to identify something as a pure substance? Why do you think they need to know if something is a compound or an element?

They need to know

Explanation:

Because if we didn't know that something was a compound of an element we could either blow ourselves up when we are mixing them or when we are looking for something bad between the compound and we don't know its a compound how do we fix it

c, liquids evaporate, creating a gas

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.