Which characteristic is shared by both dark matter and baryonic matter?

The characteristic shared by both dark matter and baryonic matter is that **they both have gravity**.

- Dark matter exerts gravitational influence, which is crucial for explaining the rotation of galaxies and the large-scale structure of the universe.
- Baryonic matter, which includes all the ordinary matter made up of protons, neutrons, and electrons, also has mass and therefore exerts gravity.

The other options listed do not accurately describe both types of matter:
- They do not interact with each other in the same way (dark matter doesn't interact via electromagnetic forces).
- Dark matter has not been directly observed, while baryonic matter has been.
- While baryonic matter can absorb light (as it interacts via electromagnetic forces), dark matter does not absorb light.