Answer:
true
Explanation:
stars can change bc Stars change over time. ... It is in the clouds of dust and gas that stars are born. As more and more of the gas (which is mostly hydrogen) is pulled together by gravity into a cloud, the cloud starts to spin. The gas atoms start to bump into each other faster and faster.
Answer: Interventional Study
Explanation: When a treatment group is compared to standard (control) group it is called Interventional Study
