Resources: BioGears!, Canadian Lung Association, Dictionary.com, iStock, Tony Amato’s Tinkercad page, ssylvia19’s Tinkercad page, CDC, National Cancer Institute(.gov), ncbi, Medline Plus, Cleveland Clinic, Mayo Clinic, American Lung Association, lung.org, and the American Cancer Society

Some of these resources, such as CDC, ncbi, and Cleveland Clinic have been used more than once, so the link leads to one of the pages that were used or their home page.