The primary difference between natural and artificial selection is Multiple choice question. that only natural selection can lead to change in organisms on which it is acting. how the seeds of a plant are spread (by humans or by natural means, such as animals, wind, etc.) where the organisms are growing (in a farm versus a natural habitat) how the parents are chosen (by humans or because of their reproductive success)

Bob, a nutritionist who works for the university medical center, has been asked to prepare special diets for two patients, susan and tom. bob has decided that susan's meals should contain at least 320 mg of calcium, 17 mg of iron, and 42 mg of vitamin c, whereas tom's meals should contain at least 280 mg of calcium, 13 mg of iron, and 34 mg of vitamin c. bob has also decided that the meals are to be prepared from three basic food