Answers. Best Answer: The .925 does mean sterling silver and the FB may be a Hallmark. You did not state what is on the medallion so I don't know where it was made. On some silver items the FB stands for Franz Bibus a Czech silversmith.
The core of Darwin's theory is natural selection, a process that occurs over successive generations and is defined as the differential reproduction of genotypes. Natural selection requires heritable variation in a given trait, and differential survival and reproduction associated with possession of that trait.
Definition of natural for Students. 1  1 : found in or produced by nature That's her natural hair color. a natural lake. 2  2 : being or acting as expected : normal a natural reaction. 3  3 : present or existing at birth : born in a person or animal natural instincts natural curiosity.