Use the word bank below to answer the questions that follow: chemical mixture heat capacity
homogeneous viscosity sublimation
physical property compound chemical formula
substance density mass
temperature pressure heterogeneous
A ___ is two or more substances that are together in the same place but are not chemically combined.
your answer goes here__

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)