How did earth's organisms change during the first period of the paleozoic?

Answer 1

Here's the evolutionary process. We started off as bacteria ( some say from meteors) which then kept on adapting and changing in the water to fish. These fish became frogs (but thats reptile evolution). Anyway, we stayed fish until around the jurassic when we were whales. we eventually crayled onto land into something like a tiger, then we got smaller like rats. Dinosaurs went extinct but we were too small to be effected, so we then started getting bigger again. we became monkeys. these monkeys lived dominantly in Africa and Europe. the europeans were too stupid to evolve and died out, but the africans got smarter, invented fire and eventually became us.

Answer 2

Many of the animals began to die off and became extinct.