What is the largest biome on earth?

The largest biome on earth is the marine biome, which covers more than 70% of the planet's surface. It includes a range of ecosystems such as coral reefs, open ocean, and deep sea. The average depth of the ocean is about 2.5 miles, and the deepest point is the Challenger Deep in the Mariana Trench, which is 36,000 feet below the surface. The marine biome is home to a diverse range of species, some of which have yet to be discovered. It is also important for human activities such as transportation, fishing, and recreation. However, it is facing numerous threats from pollution, overfishing, and climate change. Conservation efforts are crucial to preserving the health and biodiversity of this important biome.