10. sweating

Return to History 8 Human Origins Vocabulary

Because the most temperature sensitive organ in the human body is the brain, when early humans gained sweat glands their brains were able to expand.The human brain is in danger when it over heats so having a way to make the body cool faster gives the brain more time to cool and less of an opportunity to put the person or animal at risk.

Sources:

https://helix.northwestern.edu/article/evolving-skin

http://www.independent.co.uk/news/science/why-humans-lost-their-body-hair-to-stop-their-brains-from-overheating-as-we-evolved-8498623.html

By: Grace Knowles