Which evidence supports the idea that Cosmic Microwave Background radiation is a remnant of the Big Bang? A. Its temperature is uniform.
B. Its temperature fluctuates greatly.
C. Its mass fluctuates greatly.
D. Its mass is uniform.

A. Its temperature is uniform.

Explanation:

Cosmic Microwave Background radiation is a remnant of the Big Bang talks about the universe being very hot thereby causing its expansion with a corresponding cooling of the gases within it. The Cosmic Microwave Background radiation being what is left of the radiation after the Big Bang occurrence.

The temperature was uniform with very little fluctuations which makes the A the right choice.

frequency, z, and the collision density, z, in carbon dioxide (co2), r 180 pm at 30 °c and 120 kpa