Scientists believe that life on Earth began in the ocean, approximately 4 billion years ago. And in fact, it was only about 500 million years ago that life emerged from the ocean onto the land. That means that ocean life has existed 8 times longer. So no matter how unimaginably long it was since the first creatures crawled out on land... to the age of the dinosaurs... to our time, all of that is but a small slice of the pie compared to the vast span of time in which the oceans have nurtured life. And even today, although living things now exist on nearly every part of the Earth's surface, in so many different forms, the ocean continues to be critically important to life on Earth.Many creatures live in the sea, including ones that most people have not even heard about. Some of these animals live deep in the sea, while others swim around only in the upper regions. Of the many sea creatures that exist, some of the best known are sharks, dolphins and whales. There are also bony fish and other creatures that live deep down and are rarely seen...
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