Which biome covers approximately three-quarters of the Earth's surface?

The marine biome is characterized by its vast oceans, which cover about 71% of the Earth's surface. This biome includes various ecosystems such as coral reefs, open oceans, and coastal areas. The prevalence of water in the marine biome supports diverse life forms, including fish, marine mammals, and a wide range of invertebrates.

This extensive coverage plays a crucial role in regulating the Earth's climate and supporting global weather patterns. Additionally, the marine biome is essential for the oxygen cycle, as many marine organisms, particularly phytoplankton, produce significant amounts of the Earth's oxygen through photosynthesis.

In comparison, the other biomes like freshwater, tundra, and desert represent much smaller portions of the Earth's total surface area. Freshwater biomes, found in lakes, rivers, and wetlands, occupy a tiny fraction of the Earth's surface. Tundra regions, known for their cold climates and permafrost, cover limited areas primarily in the Arctic and Antarctic regions. Deserts, characterized by low precipitation and arid conditions, also cover a relatively small area when compared to the vastness of the oceans. Thus, the marine biome undeniably covers the largest part of the Earth's surface.