A scientist adds different ammounts of salt to 5 bottles of water. She then measures how long it takes for the water to boil. What is the responding variable in this experiment? a. The brand of salt used b. The amount of salt added to the water c. The time it takes for the water to boil d. The kind of bottles used

What element breaks down into yttrium-90?

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)

Which tool is least in predicting weather