Answer – There is only one aquatic biome included among the 5 major biomes of the world. It is further divided into freshwater and marine habitats.
Explanation:
The aquatic biome is the largest part of the biosphere, accounting for 75% of the Earth’s surface. It is where life formed for the first time 3.7 billions of years ago. It includes all regions composed largely of water and can be grouped into 2 main types of habitats: marine and freshwater.
Marine habitats comprise all aquatic regions with salt concentrations greater than 1%. These include oceans, seas, and coral reefs. Freshwater habitats, on the other hand, encompass all aquatic regions with salt concentrations less than 1%. They include moving water bodies such as streams and rivers as well as stagnant water bodies such as ponds, lakes, and wetlands.
Some regions exist where freshwater and seawater mix. These are commonly found where rivers and streams merge with oceans and are known as estuaries.
All aquatic habitats are home to organisms ranging from amphibians, reptiles, invertebrates, and fish to mammals and birds. Vegetation also exists in diverse forms such as grasses, seaweed, algae, and plankton, among others.
