Starfish ocean wonder
According to science, starfish or sea stars are echinoderms belonging to the class Asteroidea. In fact, there are about 1,800 living species of starfish that occur in all the world’s oceans. In particular, in the Atlantic, the Pacific, the Indian, as well as in the Arctic and the Southern Ocean, including 150 species in Russia. However, you can’t find a starfish in freshwater environments. Starfish and other echinoderms pump water directly into their bodies, via the water vascular system, as they find it. This makes them vulnerable to all forms of water pollution, as they have little ability to filter the water of toxins and contaminants. Oil spills and similar events often take a toll on echinoderm populations that carry consequences for the ecosystem.