Answer the following question given this paragraph: 

the law of conservation of matter, which says that matter cannot be created or destroyed. This means we must have the same number of protons and neutrons on both sides of the nuclear equation. If our uranium nucleus loses 2 protons, there are 90 protons remaining, identifying the element as thorium. Moreover, if we lose four nuclear particles of the original 235, there are 231 remaining. Thus we use subtraction to identify the isotope of the Th atom—in this case,.


Q: The law of conservation of matter, which says that matter cannot be created or this?

 Choices:

- abandoned

- damaged

- stopped

- destroyed

A:
destroyed
