The earliest life forms is said to have occured just after the oceans formed 4.41 billion years ago. And the Cambrian Period saw an explosion of life at sea, and that included the Trilobites. Hundreds of million years took place, and evolved some of the largest marine and freshwater animals ever existed, but then died out during the major extinction events. These extinct creatures are the biggest of their kinds. Can you name the largest prehistoric aquatic animals?
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