Answer:
The region of the 'early universe' whose matter density was higher than the average was most likely to become a 'galaxy'.
Step-by-step explanation:
- For an object to be subjected to gravity, it needs to have a specifically higher density.
- During the formation of galaxies in the early universe, 'the action of gravity' within and over the dense regions of the universe is believed to have 'played a significant role'.
- The regions which are found in the universe denser than average were the regions where the 'first galaxies of the universe' were formed.