What primarily defines the habitat of marine biomes?

The habitat of marine biomes is primarily defined by saltwater oceans and seas. Marine biomes encompass the vast bodies of saltwater that cover a significant portion of the Earth's surface, around 71%. These biomes include a variety of environments such as coral reefs, estuaries, and the deep ocean, all characterized by their salt content, which is essential for the diverse range of organisms that inhabit these areas.

Marine organisms, from the smallest plankton to the largest whales, are adapted to the saline conditions of these environments. The salinity of the water influences many ecological factors, including the types of species that can thrive there, their reproductive processes, and their overall physiology. As a crucial element of Earth's ecosystems, marine biomes play a significant role in global weather patterns, nutrient cycling, and carbon storage, making them vital to both environmental health and biodiversity.