Deep Sea Animalslive in the marine ecosystem or in oceans. If you look at the marine biology, you will find millions of species of sea animals. The marine life is a large resource that offers tourism, research and recreation for many countries across the globe. Marine life helps to determine the very nature of our planet. All the Deep Sea Animals along with other organisms such as algae and corals contribute to the oxygen cycle and regulate our earth's climate, this is why the marine ecosystem is considered to be very delicate and it needs to be protected. All these animals live in saltwater habitats. They live in or near rock pools, the ocean, beaches, mangroves and sand dunes.