Assuming they are both at room temperature and atmospheric pressure, how does the number of molecules in 1 l of oxygen gas compare with the number of molecules in 1 l of carbon dioxide gas

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)