system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Dead red blood cells are what gives our feces its distinctive brown colour. Does this imply that Vulcan fecal matter will be a deep dark green? Or does their anatomy differ wildly to ours?
gpt
Not really, what gives our faeces they brown colour is bilirubin which indeed is produced by degrading the heme part from hemoglobin but all the Fe gets absorbed before the bilirubin gets in to our digestive tract.

If the green colour of Vulcan blood stems from their version of hemoglobin just with coper instead of iron and they metabolise the heme part the same way there faeces would be exact the same colour because all copper got absorbed before the bilirubin got to the digestive tract.