The Importance of Anti-Matter

The universe can do both of these things and so it does. In some cases, we have like multiple ways to categorize what is matter and what is anti-matter. If I take a quark and an anti-part would I flip some other other signs, do they still annihilate? They can only happen for quarks that have opposite electric charges that can balance out to zero electric charge. It's a little bit more complicated for the color charge because gluons themselves are colored. On photons don't have any charge, for example, so it's simple plus and minus annihilate to zero charge photons.