What is the unit used to measure the atomic mass?

When would a bouncy ball have the most potential energy

How can one make a supersaturated solution? (apex)

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)