Bibliography used in the topic "The ecosystems" of Biology and Geology 4th ESO
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Biological adaptation. (2017, September 4). Wikipedia, The Free Encyclopedia. Consultation date: 05:40, September 12, 2017 from https://es.wikipedia.org/w/index.php?title=Adaptaci%C3%B3n_biol%C3%B3gica&oldid=101635904.
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Ecosystem dynamics. (s. f.). Retrieved March 31, 2016, from http://recursostic.educacion.es/secundaria/edad/4esobiologia/4quincena10/index_4quincena10.htm
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Ecotone. (2017, August 26). Wikipedia, The Free Encyclopedia. Consultation date: 15:05, September 5, 2017 from https://es.wikipedia.org/w/index.php?title=Ecotono&oldid=101429173.
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General and specialized species. (2017, May 26). Wikipedia, The Free Encyclopedia. Date of consultation: 19:46, September 11, 2017 from https://es.wikipedia.org/w/index.php?title=Especies_generalistas_y_especializadas&oldid=99407930 .
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Trophic level. (2017, July 27). Wikipedia, The Free Encyclopedia . Consultation date: 18:51, September 3, 2017 from https://es.wikipedia.org/w/index.php?title=Nivel_tr%C3%B3fico&oldid=100747373 .
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Biosphere Project. (s. f.). Retrieved April 2, 2016, from http://recursostic.educacion.es/ciencias/biosfera/web/alumno/4ESO/Dinamica/contenidos.htm
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(s. f.). Retrieved March 31, 2016, from http://e-ducativa.catedu.es/44700165/aula/archivos/repositorio/500/570/html/Unidad05/index.html