The reddish-brown color of human feces is derived from stercobilin, a tetrapyrrole[?] chemical compound created by bacterial action on bilirubin and subsequent oxidation.
... Rae, (1813-1893), travelled widely through the Canadian Arctic
Walter Raleigh, (1554?-1618), English explorer
James Clark Ross, (1800-1862), Explorer
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Robert Falcon ...