Question

based on cosmic microwave background radiation the energy from the big bang started as blank waves and became blank waves. gamma infrared microwaves radio ultraviolet x - ray

Explanation:

The energy from the Big - Bang started as high - energy gamma waves. As the universe expanded and cooled, the wavelength of these waves increased, and they became microwaves, which is what we observe as Cosmic Microwave Background Radiation.

Answer:

First blank: Gamma
Second blank: Microwaves