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| 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 Picture Stats: Views: 245 Filesize: 2.07MB Height: 761 Width: 1100 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39637 |