The answer to that is no. When sharks where first sited there was only coral, brain coral was not devopled then.
brain
Sharks do have brains but they are not as smart as dolphins or whales.
* A sharks brain is about the size of a basket ball! * Well it really depends on the size of the shark if it is a massive shark it can get up to the size of a yoga ball!
the brain is smaller in the shark
Medulla oblongata
bull sharks do have a brain they know no to attack a whale
There brain look similar.
60 Minutes - 1968 The Price of Bananas Brain Power Swimming with Sharks 41-43 was released on: USA: 9 August 2009
The core of the brain - where the spinal cord attaches. Its also the thalamus - the oldest part of the brain (and the only part in old life forms like sharks).
its the sharks the sharks dont sleep ever they can low the energy that goes to the brain so they rest but they dont sleep and they dont stop from swimming
If all those shark week shows are still fresh in my memory, i think it is their memory. they don't suffer from brain deterioration i believe, so no dementia for them.