It can bring waves that wash crabs from the sandy shore back into the ocean, where they can see many different kinds of fish.

The sea can bring all kinds of marine life, from sea turtles to seahorses.

Did you know that seahorses are the slowest-moving fish in the world? And sea turtles have been swimming in Earth's oceans for over 100 million years, meaning they outlived the dinosaurs.

The ocean also has massive marine mammals like whales and dolphins that are amazing and can  breathe air.They also share land-living ancestors with hippos and possess incredible intelligence.