Question

cambrian web quest
what is considered the ruling species of the cambrian period because it was so plentiful?
anomalocaris
trilobites
sponge
pikaia

Explanation:

Trilobites were abundant in the Cambrian Period. They had a hard exoskeleton and diverse forms. Anomalocaris was a predator but not as widespread in terms of abundance as a "ruling species" in terms of sheer numbers. Sponges were present but not the most dominant in terms of being a "ruling species" in terms of the description. Pikaia was an early chordate but not as abundant as trilobites.

Answer:

Trilobites