Passage Summary: Robin thinks you can tell if an ancient culture stayed in one place by how durable their tools were; Kendall argues that the tools they made were mostly just a result of whatever materials they had on hand.

Reasoning: Robin argues that artifact durability indicates whether a culture was nomadic or sedentary. Kendall counters that artifact composition is primarily determined by available materials.

Analysis: To find the point at issue, we apply the 'Agree/Disagree' test. Robin explicitly links artifact durability to a culture's sedentary nature. Kendall introduces an alternative explanation—material availability—which functions as a rebuttal. They are essentially disagreeing over whether artifact durability is a reliable indicator of a culture's lifestyle (nomadic vs. sedentary).