http://www.biologymad.com/
https://www.passbiology.co.nz/teacher-resources
https://www.passbiology.co.nz/biology-level-3/homeostasis
http://docbrown.info/ks3biology/ks3biology.htm
https://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/modal/v/types-of-immune-responses-innate-and-adaptive-humoral-vs-cell-mediated
http://ib.bioninja.com.au/options/option-d-human-physiology/d5-hormones-and-metabolism/feedback-loops.html
https://opentextbc.ca/biology/chapter/11-1-homeostasis-and-osmoregulation/
https://www.ck12.org/book/CK-12-Biology-Advanced-Concepts/section/17.4/
https://y13hb.wordpress.com/2013/03/28/thermoregulation-controlling-body-temperature-part-of-homeostasis/
http://oerpub.github.io/epubjs-demo-book/content/m45989.xhtml
http://sbi4u3.weebly.com/basic-feedback-mechanisms-thermoregulation.html
http://bodell.mtchs.org/OnlineBio/BIOCD/text/chapter32/concept32.1.html
https://www.passbiology.co.nz/teacher-resources
https://www.passbiology.co.nz/biology-level-3/homeostasis
http://docbrown.info/ks3biology/ks3biology.htm
https://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/modal/v/types-of-immune-responses-innate-and-adaptive-humoral-vs-cell-mediated
http://ib.bioninja.com.au/options/option-d-human-physiology/d5-hormones-and-metabolism/feedback-loops.html
https://opentextbc.ca/biology/chapter/11-1-homeostasis-and-osmoregulation/
https://www.ck12.org/book/CK-12-Biology-Advanced-Concepts/section/17.4/
https://y13hb.wordpress.com/2013/03/28/thermoregulation-controlling-body-temperature-part-of-homeostasis/
http://oerpub.github.io/epubjs-demo-book/content/m45989.xhtml
http://sbi4u3.weebly.com/basic-feedback-mechanisms-thermoregulation.html
http://bodell.mtchs.org/OnlineBio/BIOCD/text/chapter32/concept32.1.html