Answer:
The Burgess Shale contains the best record of Cambrian animal fossils. The location reveals the presence of creatures originating from the Cambrian explosion, an evolutionary burst of animal origins dating 545 to 525 million years ago. During this period, life was restricted to the world's oceans.
Explanation:
It was unbalanced and not very good
Do you mean WW1 ? People started migrating through disguise and things like that. Not sure if I’m 100% correct but it’s a starting point