How might the seasonal patterns of insect populations relate to the seasonal patterns of bird populations

The instructions for making proteins come originally from

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 two criteria must be met before scientist can use radiocarbon dating? explain your answer