(Lets hope i'm right!)
Alright, first of all, when I look at B, I see the word "hydro." Hydro is water. We know fossils don't carry water so we can eliminate B. Then, we know that it wouldn't be copper since fossils do not contain copper. Eliminate C. Then, we have D. Scientists believe that magnesium was removed from the fossils somehow since there isn't any in there. I won't get to the whole point but then your remaining choices are A.
The Answer Is A. (Iron)
Tell me if i'm right or wrong and have a lovely day! ~Pooch ♥
