Despite a lot of scientific evidence and many theories why does the origin of the universe remain a question to scientists? Select all that apply.

the two answers are number 1 and number 2

Explanation:  the big bang happened during those two time periods  

chinese civil war took place over a long period of time between 1927 and 1950. the war was interrupted when japan invaded china in 1936 and by world war ii. the war was fought between the nationalist government of china, also called the kuomintang (kmt), and the communist party of china (cpc).