Question: "If God intended man to live on bread, why didn't he create a bread tree?"
Answer: God could have created a tree that produced crusty loaves of bread, but he prefers to offer us a grain and invite us to buy a field and plant the seed. He prefers that we till the soil while he sends the rain. He prefers that we harvest the crop while he sends the sunshine. He prefers that we grind the grain and knead it and bake it while he gives us the air in our lungs and the strength in our arms. Why? Because he would rather we become partners with him in creation.