D, because the atomic mass number for carbon is 6
Well, salt water contains various amounts of salts, meanwhile fresh water does not. However, that does not mean that animals and creatures thrive in one kind, but not the other, instead, both waters are capable of holding certain fish, microbes, and even plants. Hope this helps, please mark as brainliest if possible, thank you! :)
This app is not for users doing your homework. it is for users helping with homework. do it yourself
