What things live in the ocean?

- Fish: There are over 30,000 known species of fish, and they come in all shapes and sizes. Some of the most popular fish include tuna, salmon, trout, and bass.

- Marine mammals: These include whales, dolphins, seals, sea lions, and walruses. Marine mammals are all air-breathing, and they give birth to live young.

- Seabirds: There are over 10,000 known species of seabirds, and they can be found all over the world. Some of the most common seabirds include gulls, terns, and auks.

- Reptiles: Some reptiles, such as sea turtles and saltwater crocodiles, live in the ocean. Sea turtles are air-breathing, and they come to the surface to breathe. Saltwater crocodiles are able to hold their breath for long periods of time, and they can even sleep underwater.

- Invertebrates: These are animals that do not have a backbone. Invertebrates include jellyfish, squid, octopus, and crabs. There are millions of different species of invertebrates, and they play a vital role in the ocean ecosystem.

- Plankton: These are small organisms that drift through the ocean. They include phytoplankton (algae) and zooplankton (microscopic animals). Plankton are the foundation of the ocean food chain, and they provide food for fish, marine mammals, and other animals.