Question

cambrian web quest
what is the cambrian period known for?
an huge explosion of new life forms
the first dinosaurs
camping was invented

Explanation:

The Cambrian Period is known for the "Cambrian Explosion," a rapid diversification of life forms. Dinosaurs first appeared much later, in the Mesozoic Era. And "camping was invented" is an irrelevant and incorrect option.

Answer:

An huge explosion of new life forms