How did access to limited resources lead to cooperation within the hohokam? a. the need for turquoise for trading motivated the hohokam to cooperate to dig and operate mines. b. the need for obsidian for tools and to trade encouraged the hohokam to form quarrying expeditions. c. the need for wood to construct homes and for winter heating led the hohokam to come together to gather supplies d. the need for water to farm in the desert brought the hohokam together to construct an irrigation system.