Q. Habitat for the worlds species?

Natural ecosystems provide habitat for the world's species. Forests, coral reefs and deep ocean bottoms house many species. Wetlands, through their mix of aquatic and terrestrial environments, nourish and shelter thousands of bird, fish and other animal species. Estuaries, where the currents and tides of salt water and fresh water meet, are the world's nurseries for many of the aquatic species we consume , including fish and shellfish such as clams and crabs. Lakes and rivers, for example, constitute only 0.01 percent of the planet's water, but they contain a quarter of all known species. Even open spaces in cities and towns support significant biodiversity.