The Cambrian is the first I want to talk about . It is called that because some of the first fossils were foung in Cambria. During this time every thing lived in water. There were large animals and small ones. Some of the animals include dprotozoa,profirera ,coelenterates, worms ,anthropods ,mollusks ,and echinode

There were a lot of life and still is all we can do is take history and see what else happens to life.

The Silurian period was also named after a group of people, the siluries.this was a short period but Sea lilies were getting bigger. Coral was also a very important thing.protazoans began to appear more,Radiolaria,and also the first milipede.also the first fish appears this is the first sign of vertebrates. Oceans were starting to dry up islands were forming. Plants were the first living thing to come out of water.

The Devonian period comes from the town Devon. Fishes were starting to show up more and some were protected by a outer shell. Also cockroaches the only living thing that has not changed.

The next is the Ordovician period. It i

Some common words found in the essay are:
Era Triassic, Devon Fishes, , BrachiosaursApatosaurusAllosaursand DilophosaurusSquids, ordovician period, lots changes, water water, mesozoic era, period named, period animals,
Approximate Word count = 506
Approximate Pages = 2 (250 words per page double spaced)