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Word Count: 573
The Biosphere The biosphere is part of the earth in which life exists It is 20 km thick from the bottom of the ocean to the lower atmosphere It consists of three layers the lithosphere which is the land on the surface of the earth the hydrosphere which comprises of the water on the earth as well as water vapor in the air and the atmosphere which is made up of the air that surrounds the earth The living organisms in the biosphere interact and affect each other in many ways This is called a biotic factor Similarly there are non-living elements that have an effect on living organisms these are considered abiotic factors Examples of abiotic factors are air temperature water soil light and minerals In a biosphere organisms live in special groupings For instance a population consists of all individuals of a species living in a general area A community is a population located in a certain area living among different species An ecosystem is yet a larger conglomeration of a population a community and abiotic factors Ecosystems can be aquatic or terrestrial The earths aquatic ecosystem makes up about 75 of the earths surface This aquatic environment is divided into marine and freshwater environments The earths terrestrial ecosystem is mainly made up of forests and deserts which make up for 25 of the earths surface The role or function of an organism in a community is that organisms niche An organisms niche is an area picked by that organism based on physical factors such as temperature light oxygen and carbon dioxide content and biological factors such as food competition for resources and predators This niche provides the organism a place to live in A habitat remains consistent with an organisms niche as well as provides the organism with a place to reproduce In this case organisms may have the same habitat but different niches There are three
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