Question

matter is composed of small particles - atoms or molecules - that are in constant motion. the addition or removal of heat causes the rate of motion to change and thereby change the temperature, volume, or even state of that matter. choose choose hypothesis scientific theory scientific law

Explanation:

A scientific theory is a well - substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. The statement about matter being composed of small particles (atoms or molecules) in constant motion and how heat affects their motion to change temperature, volume, or state of matter is a well - established explanation of the nature of matter and its behavior with respect to heat. A hypothesis is a proposed explanation made on the basis of limited evidence as a starting point for further investigation. A scientific law is a statement based on repeated experimental observations that describes some aspect of the universe, often in a mathematical form, and it usually describes what happens rather than explaining why it happens. So this statement is a scientific theory.

Answer:

scientific theory