What percentage oceans make up habitat available for living things?

Oceans cover about 71% of the Earth's surface and are estimated to account for approximately 97% of the planet's water. Given that oceans provide a vast range of habitats for marine life, they represent a significant portion of the overall habitat available for living things. When considering the entire biOSphere, oceans play a crucial role in supporting biodiversity, though specific percentages can vary depending on how habitats are classified. Overall, they are essential for sustaining life on Earth.