What word is used to refer to a group of organ systems working together? A: organism B: cell C: tissue D: organ​

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

Guard cells control which event? the growth of plants capture of solar energy gas exchange in leaves water absorption in roots

Which best describes carbon dioxide’s path out of the body