Final answer:
The Kawelka of highland Papua New Guinea primarily engage in subsistence agriculture and complement their diet with gathered and hunted foods.
Step-by-step explanation:
The main means of making a living among the Kawelka of highland Papua New Guinea is subsistence agriculture, similar to the practices of Kayapo people who rely on staple crops such as sweet potato, manioc, maize, and taro, combined with gathering and hunting. Their diet is also supplemented by foraged foods and hunted animals, similar to the diverse alimentary habits of other indigenous groups like the Baka and San people. While not explicitly about the Kawelka, this information helps us comprehend the overall subsistence patterns likely similar due to geographical context and cultural parallels.