Fungus because it is a living thing in its own right as opposd to a brain cell which is part of an organism.
Radiometric dating depends on radiation from carbon atoms which means only carbon based things can be dated. And life is based on carbon so basically only living things can be dated.
Henry Faulds and Galton are cousins which both helped each other like Faulds wrote a book about fingerprints which helped Galton out a lot.
Faulds was also the Father of Fingerprinting.
hope i helped ~Zuzu :)
