The answer is D. His belief is was that atoms could not be split. That is what was disproved really fast ;)
I would say
D. Gravity pulled particles of dust and gas together to form planets.Hope it helped!
A barometer is a tool, not a variable. A barometer measures barometric or air pressure, which is a variable that meteorologists use to predict the weather.
Cloning<span> occurs when identical twins, triplets, and so on are born or when a cutting from a plant is used to generate another plant. It also occurs in organisms that reproduce by asexual reproduction, such as bacteria and yeast.</span>