One of the differences between Cambrian animals and preĀ­Cambrian animals was the

appearance of _________________________ such as antennae as Cambrian animals evolved.

Verified Answer :

One of the differences between cambrian animals and precambrian animals was the appearance of Appendages such as antennae as Cambrian animals evolved

The antennal appendages will increase the sensing abilities of the animals

hope this helps

The answer to your question is

Appendages