Sentence:  He draws eclectically on studies of baboons, descriptive anthropological accounts of hunter-gatherer societies and, in a few cases, the fossil record. With this biological framework in place, Corning endeavors to show that the capitalist system as currently <WSD>practiced</WSD> in the United States and elsewhere is manifestly unfair. 
Meaning of the word marked with <WSD> tags:  To perform or observe in a habitual fashion.