Why is the Amazon basin ecologically so important?
Read lots and let us know what you discover.
http://wwf.panda.org/what_we_do/where_we_work/amazon/about_the_amazon/why_amazon_important/
https://rainforests.mongabay.com/amazon/amazon_importance.htm
https://www.e-education.psu.edu/geog30/node/395