Question

scientists theorize that the universe began as a and was very and dense. over time, the universe has , and became dense.

Explanation:

According to the Big - Bang theory in physics, the universe started as a small, hot, and dense singularity. As it expanded over time, it became less dense.

Answer:

Scientists theorize that the universe began as a small point and was very hot and dense. Over time, the universe has expanded, and became less dense.