He died of 'natural causes'. [=he died because he was ill or old and not by being killed in an accident, battle, etc.]
She was adopted immediately after she was born and never knew her 'natural' [=(more commonly) 'birth'] parents.
a country rich in 'natural resources' [=a country that has many valuable plants, animals, minerals, etc.]
(..) applause, fame! - Fame? - Yes! And with that personality, that profi le, that physique, why, he's a natural born actor, eh, Giddy? - But l'm going-- - Straight to the top. Why, l can see your name in lights, lights six feet high. - Uh-- What is your name? - Pinocchio. Pinocchio! P-l-N-- Eh, uh-- (..)1940 Pinocchio