As the flatten shark came upon and began to hide itself in the sand from others also to get its food, the population began to to grow. It made the larger sharks more targeted by other so their population decrease and evolved to get smaller. To create the stingray that lay in the shallow parts of the shore in the sea to have a new species evolve from the shark. Stingrays are formed but still grow smaller to stay more hidden, to later create skates in the late cretaceous period
As the flatten shark came upon and began to hide itself in the sand from others also to get its food, the population began to to grow. It made the larger sharks more targeted by other so their population decrease and evolved to get smaller. To create the stingray that lay in the shallow parts of the shore in the sea to have a new species evolve from the shark. Stingrays are formed but still grow smaller to stay more hidden, to later create skates in the late cretaceous period