The universe began about 14 billion years ago and has been expanding and cooling ever since. what does this statement most completely describe?
a. the doppler effect
b. the big bang theory
c. cosmic background radiation
d. light years
some one me quick 15

b. big bang theory

The big bang theory is the explanation of the events that occurred on early earth. The early earth atmosphere is associated with hot and reducing gases like carbon dioxide and methane. The oxygen was not present in the early earth atmosphere. It was liberated by the evaporation of the water and photosynthetic activity of the cynobacteria. The earth atmosphere undergone with several changes with the increase in the diversity of the plants on earth, which were responsible for the liberation of oxygen and cooling the atmosphere.

the answer is

c. parental

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