The world’s oceans are home to more than 100 million species of fish, birds, sea turtles and mammals.

In addition to our marine ecosystems, the oceans also host many species of plants, algae, bacteria and other organisms that play a vital role in the world’s food web.

They include: The ocean’s bottom – more than 90% of all life on Earth is found at the bottom of the ocean.

This is because the ocean’s deep water sits at a depth of up to 2,700 metres.

Its depth is important because its oxygen content is low, so its temperature is low and there is little heat escaping.

At the surface, most animals have a shallow, sandy bottom, where they live.

Some live at a higher level and live deep, where oxygen levels are high.

Many animals, such as dolphins and whales, have a thick layer of sand, called the seabed.

It is a protective layer of water at the surface of the water which allows them to breathe.

These animals live at the top of the seashore where they feed on marine life.