Cho 3 dung dịch cùng nồng độ cùng thể tích hcl 1m h2so4 1m hf 1m chất nài dẫn điện tốt nhất

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)