Insect pests often feed on crop plants in farmers' fields. To address this problem, scientists have developed transgenic crop plants that produce their own pest-killing chemicals. In nature, these chemicals are produced by certain bacteria.

Which of the following actions was MOST LIKELY involved in the development of the transgenic crop plants?

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms