Question

Hey... please ans my question properly anf it's urgent..... Some of the important fossil which have been studied are of organisms X, Y and Z. X were marine arthropods which were common between 400 to 600 millions years ago. Y were the invertebrate animals (molluscs) with a flat, coiled, spiral shell which lived in the sea about 180 million years ago. Z are the extinct carnivorous or herbivorous reptiles which appeared on the earth about 250 million years ago and become extinct about 65 million years ago. What are X, Y and Z??​

Answer 1

X is trilobites
Y is Ammonites
Z is dinosorous
.

Answer 2

X = Trilobites

Y= Ammonites

Z= Dinosaurs