Question

question 18 (5 points)
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during the second world war, unit 731
developed a euthanasia program that was modeled on germanys t - 4 program.
attempted to build an atomic bomb for japan, but was unable to do so.
used chinese civilians as guinea pigs for biological and chemical weapons research.
was responsible for the rape of nanking and the recruitment of \comfort women\ for the japanese military.

Explanation:

Unit 731 was a covert biological and chemical warfare research and development unit of the Imperial Japanese Army. It is infamous for using Chinese civilians (and prisoners of war) in inhumane experiments related to biological and chemical weapons. The T - 4 program was a Nazi German euthanasia program (not related to Unit 731). Japan's atomic bomb project was a different initiative (not Unit 731). The Rape of Nanking was committed by other Japanese military units, and the recruitment of "comfort women" was a separate war crime operation not directly tied to Unit 731's main activities (biological/chemical weapons research on civilians).

Answer:

used Chinese civilians as guinea pigs for biological and chemical weapons research.