Ecosystem

• Ecosystems provide important services such as nutrient cycling, water purification, and climate regulation.
• An area where all of the  living and non living and also their interactions is called an ecosystem
• Biotic factors- living things or organisms.
• Abiotic factors-The elements of the environment where these organisms live are collectively called as abiotic factors.
• Terrestrial ecosystems are those in the land.
• Forests are characterized by having large trees and woody plants. Varied plants and animals inhabit this ecosystem.
• Taiga generally referred to in north america as a boreal forest or snow forest, is a biome characterized by coniferous forest consisting mostly of pines.
• Desert have dry soil, little to no surface water, and high evaporation rate.
• Tundra are located at the North pole and have the coldest ecosystem on earth.
• Grasslands are dominated by grasses with few trees and shrubs. A lot of grazing animals, insectivores, herbivores and carnivores inhabit in the grassland.
• Biomes are large ecosystems on Earth that are characterized by climate.
• Aquatic ecosystems are those in water.
• Aquatic ecosystems, on the other hand, are subdivided into two broad categories, freshwater and marine ecosystems.
• Streams, rivers, lakes, and ponds are categorized as freshwater ecosystems because of their low salt concentration. 
• Oceans, coral reefs, and intertidal zones fall into marine ecosystems for having high salt concentration.