No, but they've remained very much the same for a very long time.
Yes they do when they are sleeping. They tend to just float when they are asleep.
That depends on the type of shark. BTW in case you were wondering, it is not true that all (most) sharks can never stop swimming and must always be moving otherwise they die. But it is true that they need flowing water.
im not sure if this iss true or not, but i think they can't swim backwards. They don't . they never have
They evolved from the most basic life forms slowly (sharks were around with the dinosaurs) until reaching their current stage.
No, never! Bottlenose dolphins get killed by sharks.
tigers sharks and bears
The first sharks like Stethacanthus evolved from 370-345 million years ago (Late Devonion to Late Carboniferous).
No, sharks don't play tag! Sharks never play any thing in the sea.
Compared to most sharkes, whale sharks are considered to be non threatening to human beings. It is the largest non mamal verterbrate in the animal kingdom.
Sharks?
By mimicing
Jake and the Never Land Pirates - 2011 Look Out--- Never-Sharks was released on: USA: 2014