What happens when a particle and its antiparticle collide? They combine nuclei
They break into quarks
They are converted to energy
They become antimatter

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

Select the correct answer. what does the process of natural selection involve?

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point