Question

Q.18. During which period did the first trilobites appear?

a) Cambrian
b) Devonian
c) Silurian
d) Ordovician

Answer 1

A. Cambrian period

Hope this helps :)

Answer 2

a) cambrian

Step-by-step explanation:

The first body fossils of trilobites appeared in the Early Cambrian Period, about 540 million years ago.