Image Credit: Freepik/X
They have a very long existence of over 450 million years and have not changed much in appearance. (Image Credit: X)
They have been living for about 500 million years with a different spiral shell and tentacles. (Image Credit: X)
They were once considered to be extinct but were rediscovered in 1938. They have existed for about 400 million years. (Image Credit: X)
These species known for their appearance are surviving from over 500 million years. (Image Credit: Freepik)
Sharks have a registered existence of over 400 million years. (Image Credit: Freepik)
The creature looks like an eel and has existed for over 300 million years. (Image Credit: X)
These parasites, also called jawless fish, have existed for about 360 million years. (Image Credit: X)
It is one of the oldest multicellular organisms with around 600 million years of age. (Image Credit: Freepik)