In nuclear physics, a magic number is a number of nucleons such that they are arranged into complete shells within the atomic nucleus.
The answer is D. Or, the answer could also be 60, I'm not sure.
Sedimentary Rock
Here's Why:
Fossils also form from molds and casts. If an organism completely dissolves in sedimentary rock, it can leave an impression of its exterior in the rock, called an external mold.
I got this information from http://www.livescience.com/37781-how-do-fossils
I hope this helps:)
