Question

the universe expanded and cooled and the four fundamental forces of nature became independent in the first ______ of the universe.
□ minute
□ second
□ hour
rewatch

Explanation:

In the early universe's development, the four fundamental forces (gravity, electromagnetic, weak, strong) became distinct very rapidly. The correct time frame for this separation is the first second of the universe's existence, as cosmic evolution events like force differentiation occur in extremely short initial time scales, not minutes or hours.

Answer:

B. second (assuming the options are labeled with A, B, C where B is "second"; if original labels differ, adjust to match, e.g., the option with "second" text)