Which of thomas hunt morgns hypothesis was valid

Plz ! ive been stuck on this forever

You are working in the lab and are working with the same element but with varying isotopes of the element. you are working with c-11, c-13, c-14, and c-15. what is the average atomic mass of this element? (use periodic table) a- 12 b-15 c-14 d-13

Which organelle breaks down sugar molecules that supply energy to the cell ?