Of all the wild animals in their area, none was more useful to the tribes in Indus Valley than the black-tailed deer: it was a source of meat, and its hide was used for clothing, its antlers and bones for tools, and its sinews and gut for bindings and glue.
Above is a correct sentence that I have sort of modified from the official gmac version. Can someone please help explain how parallelism is maintained in this sentence given that it uses "and" twice?
it was a source of meat, and its hide was used for clothing, its antlers and bones for tools, and its sinews and gut for bindings and glue.