Answer:
O Trilobites
Explanation:
The first mass extinction that occurred between the Paleozoic and the Mesozoic era caused the extinction of the trilobites.
Extinction are catastrophic events that causes the loss of organisms on the earth surface. Several factors can lead to extinction.
- The first mass extinction took place between the Paleozoic and the Mesozoic era.
- This wiped out one of the most successful organism on the earth surface at that time.
- They were the trilobites.
