Page 27 - Sharks teeth to tail
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FACTS
How do you tell the age of a a a shark?
Some shark spinal cord fossils have been found Those spinal cords are also made of cartilage One of the ways marine biologists can estimate the the age of a a a shark is by counting the the growth rings on on the vertebrae sort of like counting rings on on a a tree trunk shark spinal cord fossil tree trunk rings
