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" The fossil record includes about 2100 species of crinoids and 800 species survive today
sea cucumbers
When compared with the sail of Dimetrodon
Evolution of Fish
Charnia is the genus name given to a frond-like Precambrian lifeform with segmented ridges branching alternately to the right and left from a zig-zag medial suture
Megalodon Shark 46 Tooth Set Kentrosaurus " The fossil record includes46 Megalodon Tooth Replica Set 24 Upper Teeth. The Largest tooth is 5 inches. The smallest tooth is 1 inches. 22 Lower Teeth. The Largest tooth is 5 inches. The smallest tooth is 2 inches. In total, Megalodon had 46 front row teeth, 24 in the upper jaw and 22 in the lower jaw. Most sharks have at least six rows of teeth, so a Megalodon had about 276 teeth at any given time. This 46 tooth set comes unpainted and cast in gray resin. Each tooth is
US$ 15.95
US$ 39.95
US$ 17.10