If the value of mass doubles but the volume stays the same, the value for density will be

In a floral arrangement, the focal area is often

Can someone me with these questions plz.

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)