Answer:
4.) because you can only change one factor in an experiment so if you notice something, you'll know what caused it.
5.) an assumption made before any research has been completed for the sake of testing. A theory on the other hand is a principle set to explain phenomena already supported by data
6.) science- the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
Explanation: You can paraphrase on number 6 if you would like to
