Discuss the importance of the change in CO with exercise?

Nucleic acid certain protein cell membranes certain carbohydrates

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

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity