The atomic mass of an element is found of which of the following methods?

a.) doubling the number of protons
b.) identifying the number of protons
c.) adding the number of protons and neutrons
d.) adding the number of protons and electrons

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)