http://www.actionbioscience.org/environment/esa.html
https://en.wikipedia.org/wiki/Abiotic_component
https://en.wikipedia.org/wiki/Biotic_component
https://www.youtube.com/watch?time_continue=1&v=fUn-aQwMnac
https://www.youtube.com/watch?v=MdlwPtKg-VI
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https://prezi.com/l99qcsk-tv-b/relationships-between-abiotic-and-biotic-factors/
https://www.youtube.com/watch?v=6v2L2UGZJAM
Holt and Science and Technology: Environmental Science
https://prezi.com/d4xzggoky5rw/how-does-symbiosis-affect-our-ecosystem-pt-1/
https://www.britannica.com/science/commensalism
http://www.greenlivinganswers.com/archives/172
https://ourworld.unu.edu/en/does-this-abundant-crustacean-need-protection-from-our-appetite
http://www.nesc.wvu.edu/pdf/emergency/WW_resources/GNBKGN12/chap4.pdf
http://anusawesomeeportfolio.weebly.com/bio-blog/archives/05-2013