MATERIAL DESCARGADO DE: https://www.webcolegios.com/teodoro/guias/7252a0.pdf
http://www.colegiobojacachia.edu.co/wp-content/uploads/2020/03/GUIA-2-CIENCIAS-GRADO-6.pdf
https://edebe.com/educacion/documentos/79224-0-529-eso3_biogeo_and_ud4.pdf
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