I have a bunch of videos that I have to watch and put in answers can anyone help me

Why do you suppose the structural polysaccharide cellulose does not contain branches?

In the 1500s, an astronomer developed a new model of the universe. this model had the sun at the center of the universe, not earth. who was this astronomer?

Steven hawking is on record as saying that viruses can be considered a form of life. considering the list above, what might be his evidence? a) item 5 b) items 1 - 3 c) items 4 - 7 d) items 1 & 2