Question

Which types of baryonic matter are most abundant in the universe? Select the two correct answers.
Responses

oxygen
oxygen - no response given

nitrogen
nitrogen - no response given

helium
helium - no response given

carbon
carbon - no response given

hydrogen

Answer 1

The two most abundant types of baryonic matter in the universe are:

1. **Hydrogen**
2. **Helium**

These two elements make up the majority of the ordinary (baryonic) matter in the universe, with hydrogen being the most abundant.