Putrescine is produced during the decay and protein breakdown of meats and is responsible for some of the odor found in them. Identify the functional group circled. 
Definitions:
Facial Expressions
The movements and expressions made by the face that communicate emotional states or reactions.
Sex Customs
Traditional behaviors related to sexual relationships and practices within a particular culture or society.
Alcoholic Beverages
Drinks containing ethanol, commonly known as alcohol, produced by the fermentation of grains, fruits, or other sources of sugar.
Proximity
The physical closeness or distance of objects or individuals, which can influence various psychological and sociological phenomena, including attraction and relationship formation.
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