Structures represented in the illustration below are found in the lower epidermis of a plant leaf the illustration at right shows the response to a certain environmental condition the response represented in the illustration would most likely be caused by?

Flock x flock y flock z total pieces of food eaten (from previous page) 147 93 60 food percentage* % % % simulated number of birds in flock for 3rd generation** * divide each flock's total pieces of food by 300, the total number of pieces of food eaten. ** multiply the food percentage for each flock by the total number of birds (30).