A potato has a volume of 800cubic centimeters and a mass of 400grams. Calculate its density. Write your answer to the tenths place.

Nonpoint source pollution is difficult to control because it

How do you know when a chemical reaction has occurred

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)