What is the medical term for the use of liquid nitrogen or argon gas in a probe to freeze and kill abnormal tissue?

The answer is Cryosurgery
It is the use of liquid nitrogen or argon gas in a probe to freeze and kill abnormal tissue. Cryosurgery is a type of surgery that involves the use of extreme cold to destroy abnormal tissues, such as tumors. It involves the use of liquid nitrogen, although carbon dioxide and argon may also be used. 

Interacting group of various species in a common location. for example, a forest of trees and undergrowth plants, inhabited by animals and rooted in soil containing bacteria and fungi, constitutes a biological community.

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