What is the advantage of having air spaces within leaves?

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

This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement

Which of these is not an obstical to the future of space exploration? fundingresearch ideas technologytime