Diethyl ether is no longer used as a general anesthetic. Why? A. More effective anesthetics have been developed.
B. One of its side effects is nausea.
C. All of these.
D. It is very flammable.

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)