While elements and compounds can both be classified as pure substances because they have distinct properties and composition, cannot be decomposed further. a) compounds b) elements c) formulas d) molecules

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)