What is one piece of evidence that proves the big bang theory

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

Enzymes affect the reactions in living cells by changing the

There is one girl i like and i don't know how to tell her that, i have a feeling she knows but if she doesn't i don't want to make a fool out of myself how is one way to boost my confidence on asking her out