I think a controlled experiment
Answer:
atomic number
Explanation:
isotope is a family of an element with the same atomic number but different mass number.
2)The particles in a liquid are moving past one another constantly.
3)The particles in gas move freely in all directions.
4)The particles in a solid vibrate in a fixed position.
6)The particles in a gas have few attractions between them.
7)The particles in all states of matter are always moving.
Answer: it gets inside the air and then it infects the air's resourses
Explanation:
