There are millions of tiny plants and animals living under the seawhere are so small that youan't see them unless you use micoscope. These are caled plankton but lots of fish eat theseplants and animals. Whales are the most largest living animals. The Blue Whale can grow up to33 meters in length and weight up to 200 tons. Whales need to come up to the surtace tobreathe occasional. Dolphins need to come to the surface to breathe, too. Dolphins are verysmart creature. They can talk to each other on a kind of sound" language. An octopus haseight legs calling tentacles. These have suction(4JJ) pads on they which the octopus uses tcatch crabs and small fish.