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Sources:
Mammal Ears
https://press.nature.com/cretaceous-fossil-reveals-a-new-pattern-in-mammalian-middle-ear-/17413100
https://www.nature.com/articles/s41586-019-1792-0
https://www.nature.com/articles/d41586-019-03605-1
http://www.geo.utexas.edu/faculty/rowe/Publications/pdf/023%20Rowe1996a.pdf
https://royalsocietypublishing.org/doi/full/10.1098/rspb.2016.2416
https://evolution.berkeley.edu/evolibrary/article/evograms_05
https://www.ncbi.nlm.nih.gov/pubmed/19674542
https://www.britannica.com/animal/reptile/Hearing
HIV
https://www.eurekalert.org/pub_releases/2019-11/aaft-eat112519.php
http://dx.doi.org/10.1126/scitranslmed.aax7350
https://aidsinfo.nih.gov/understanding-hiv-aids/fact-sheets/19/93/what-is-a-latent-hiv-reservoir-
https://stm.sciencemag.org/content/11/520/eaax7350
Image Credits:
https://www.eurekalert.org/multimedia/pub/218153.php
https://commons.wikimedia.org/wiki/File:Ptilodus_skull_BW.jpg
https://commons.wikimedia.org/wiki/File:Taeniolabis_NT_small.jpg
https://commons.wikimedia.org/wiki/File:Blausen_0330_EarAnatomy_MiddleEar.png
https://commons.wikimedia.org/wiki/File:Gray919.png
https://commons.wikimedia.org/wiki/File:Gray918.png
https://commons.wikimedia.org/wiki/File:Gray917.png
https://commons.wikimedia.org/wiki/File:Gray916.png
https://commons.wikimedia.org/wiki/File:Jaw_joint_-_mammal_n_non-mammal.png