Imagine that there is a group that does not use instruments, but an individual replicates the sound of drums to maintain the beat. What term BEST describes this group? Chorus quartet a cappella orchestra

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)