The marine biome is made up of all of the oceans of the world. Biomes are areas on Earth with similar climates, animals, and plants.
Oceans cover most of Earth’s surface. In fact, they cover around 70% of the Earth. The oceans can be very deep. Scientists have divided the oceans up into three zones. The top zone is the sunlit zone. It is about 600 feet deep. Sunlight can reach the water in the sunlit zone. This means that plants can get energy from the sun to grow. Most of the plants and animals that live in the marine biome live in the sunlit zone.
The next zone is called the twilight zone. This zone is too deep for much sunlight to reach, so no plants live in this zone. The animals that live in this zone have adapted to live without sunlight. Some animals make their own light.
The deepest zone is called the midnight zone. This zone is completely dark. It is very cold. The animals that live in this zone eat bacteria. The bacteria get energy from chemicals on the ocean floor. Shrimp, crabs, clams, and even fish survive in the midnight layer by eating the bacteria. These animals are different from the animals that live in the sunlit layer because they have never seen sunlight.
In the sunlit zone plants get energy from the sun through photosynthesis. Photosynthesis is the process of plants making their own food from sunlight. Algae makes its own food with energy from the sun.
There are many colorful plants under the ocean. In order to blend in with the colorful plants, many fish are brightly colored in the sunlit zone. This helps them hide from predators who want to eat them. The angel fish and lionfish are two brightly colored fish that live in the marine biome.