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Paleozoic Marine Invertebrates

Description
Eukaryotes
First were single celled
Cells contain nuclei
More advanced organisms than prokaryotes

Paleozoic Era: Life Explodes

Paleozoic marks the first appearance of life forms with hard parts such as shells
Resulted in abundant Paleozoic fossils
Life in the early Paleozoic was restricted to the seas and consisted of several invertebrate groups including
Trilobites
Cephalopods
Sponges
Corals
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