Describe how human beings are part of the ecosystem of the earth and that human activity can purposefully, or accidentally, alter the balance in ecosystems. lessons

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.