If you can get this right, you get 15 points. I know the answer but do you?
How Do Glow Sticks Glow?

How is the atomic number of a nucleus changed by alpha decay

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.

Which is an example of a reversible physical change?