Check all the characteristics below that describe compounds. two or more elements chemically combined elements one type of atom cannot be separated into a simpler form definite proportions

A compound can be defined as a substance which is composed of the two or more elements that are combined together chemically. These constituent elements are present in definite proportion and quantities. The composing elements of a compound can be separated only by the means of the chemical procedures. A compound is composed of more than one type of atom.

Hence, the answer is ' two or more elements , chemically combined elements, more and definite proportions'.

chemical because it warmed up which involves temperature and it bubbled which includes changing

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a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.