It is either carcinogens or viruses (I think the first) I hope this helps!
Elliptical galaxies. I hope thats correct.
Genetically modified foods are foods that have been engineered (changed/altered) to produce from the original food to have a change in DNA using genetic engineering. For example cotton candy grapes, there isn’t such thing as a real cotton candy grape, the flavor of the grape been modified to taste like cotton candy.
The answer is C I don’t think this needs more explanation but if needed just ask!