7. The variable that stays constant when using the combined gas law is a. amount of
gas.
b. pressure.
c. temperature.
d. volume

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)