Corn, Squash, and bean; these 3 plants all assist each other in growth, one providing nitrogen to the soil, one allowing the other to grow on it, and the other providing shade acting like a mulch. These three plants help each other grow big and strong; however, this would all be wasted without bees. Without bees, the tree sisters would struggle to produce their beautiful bountiful vegetables and legumes.
Without the native Americans may not have survived the harsh southwest. Assisting with biodiversity means many plants can grow means habitats for other species.