1) In ‘The Gorgeous Remains of an Ancient Sea,’ how long ago did the structures form? 2) (Answer both parts) Why are there shells there? AND, where is there; what state is this?

3) In ‘From the Cambrian Explosion to the Great Dying,’ during the early Cambrian,
what increased that ‘allowed life to flourish?’
4) What did the ‘first large predatory organisms’ hunt?
5) During the Ordovician, how large did the cephalopod Camerosceras grow?
6) What was responsible for temperatures dropping at the end of the Ordovician, leading to the Ordovician-Silurian Extinction Event
7) What percentage of marine species died out at the end of the Ordovician?
8) As Pangea was coming together during the Carboniferous, why did humidity levels drop, resulting in the collapse of forests?
9) What do we believe were the two causes of the Permian-Triassic Extinction Event? ___
10) What percentage of marine species ‘were wiped out’ during the Permian-Triassic Extinction Event?