Explanation : A lexical family is the set of words that derive from the same root. The word "hormiga" comes from the Latin (formica), so formic also belongs to this lexical family although it is closer to the Latin root.
Some minerals in rocks and organic matter for example bones and shells can contain radioactive isotopes. Any of parent and daughter isotopes in a sample can be measured and used to determine their age. This is known as radiometric dating.