Life sciences department, botany section signage

Department signage

The Life Sciences Department was a department aboard Constitution-class starships that was responsible for the studies of all biology-related matters. One section within this department was the botany section. (TOS: "The Man Trap")

In 2265, Doctor Mark Piper was the head of the USS Enterprise's life sciences department. (TOS: "Where No Man Has Gone Before")

In 2267, Captain James T. Kirk asked both the medical and life sciences departments to investigate the Denevan flying parasite. (TOS: "Operation -- Annihilate!")

This would seem to suggest that the life sciences and medical departments could operate separately from one another.
In the final draft script of TOS: "Mudd's Women", Magda Kovacs was established as having spoken to a "chap in life sciences" (in the words of Harcourt Fenton Mudd) who had told her about the condition of three miners on Rigel XII.
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