The answer is the letter A. V, II, III, IV, I- Bacteria, Trilobites, Winged insects, Dinosauria, Humans
*Bacteria - is known to be the oldest life form on earth, appeared during Precambrian time.
*Trilobites- appeared in the Cambrian period (trilobites are now extinct).
*Winged insects- appeared during the Ordovician period.
*Dinosauria- appeared during the Mesozoic era.
*Humans- appeared during the Cenozoic era.