Which of the following does not contain carbon from the bodies of plants and animals that died millions of years ago?
a. natural gas
b. oil
c. coal
d. phosphate salts

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)