Sharks have been on Earth for more than 400 million years and they have changed very little during that time; they are an extremely successful animal. Skates and rays evolved from sharks and have been on earth for about 150 million years; however, the fossil record of these creatures is limited to teeth and scales as their cartilaginous skeletons do not survive after they die.
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How long have elasmobranchs been on Earth?
- Marine Life
- Elasmobranchs