Ernst Haeckel, german, 1834-1919 creator of the term ecology and considerate the founder of this study sued to say:

"The ecology it is the relationship between the living being and the environment or the distribution and abundance of the living beings, and how this is affected by the interaction between the organism and the environment. The environment includes the physic properties that can be describes as the sum of local abiotic factors, like the climate and the geology, and the other organism that share that habitat (biotic factors). There is many practical applications in the ecology that applies to the conservation biology , how to protect and preserve the swaps ,the natural resources (the farm-ecology, agriculture, forestry, fishing), the pacification in the city (urban ecology ), the communitarian health , economy , the apply science , the human social interaction(human ecology) and many other natural elements of a scientific interest , historical o economic…"

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