HELP PLEAS 5TH GRADE SCIENCE A scientist studying the Milky Way galaxy notices a bright light in the sky. What information would she need to prove that the object is a comet and not a star? Does the object move?

Is there gas in the object?

How big is the object?

Are there other objects orbiting it?

II only

III only

I and II

I and III

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

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)