Plz I need help question in photo

Nonpoint source pollution is difficult to control because it

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)

If an atom has 12 protons and 13 neutrons