How does a squirrel get prepare for the winter months?

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)

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

What four properties do all waves have in common