Biology

Canines

Malaria:
http://xkcd.com/51/

Gas Embolism:
http://www.smbc-comics.com/index.php?db=comics&id=959#comic
An air bubble in the veins or arteries can block blood flow causing stroke or heart attack-like symptoms.

Cell Division:
http://www.lefthandedtoons.com/44/

Bacteria:
http://buttersafe.com/2007/04/12/the-tiniest-hug/

Evolution:
http://www.smbc-comics.com/index.php?db=comics&id=574#comic

Brains:
Caudate nucleus: http://www.smbc-comics.com/index.php?db=comics&id=874#comic

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