Question

which period is older than the triassic period?
cambrian
cretaceous
jurassic
paleogene

Explanation:

The Cambrian period is part of the Paleozoic era and predates the Triassic period which is part of the Mesozoic era. The Cretaceous and Jurassic periods are also in the Mesozoic era and are younger than the Triassic. The Paleogene is part of the Cenozoic era and is much younger.

Answer:

A. Cambrian