What is the correct formula for calculating the average atomic mass of an element?

Compare and contrast region e in the illustration above with region d. describe the physical characteristics of each region.

Do you think the gene eef1 alpha1 supports cell theory? explain your response.

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d