Kirk undergoing bioformation

Bioforming was a process that involved the transformation of an individual's physiology at a cellular level. Once bioformed, an individual could live in environments that would otherwise be deadly to their species. However, they could no longer tolerate their natural environment. In this sense, it was the opposite of terraforming. (VOY: "Demon")

In 2269, Captain James T. Kirk and Commander Spock experienced a type of bioforming on Argo, rendering them unable to breathe out of water. (TAS: "The Ambergris Element")

In 2374, The Doctor diagnosed Lieutenant Tom Paris and Ensign Harry Kim as having been bioformed on a class Y planet in the Vaskan sector of the Delta Quadrant, which left them unable to survive in class M environments. It was later discovered that they were in fact duplicates of the real Paris and Kim, formed out of the Silver Blood indigenous to the planet. (VOY: "Demon")

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