Certain traits and abilities made humans more adaptable to climate changes than other animals. identify each trait as belonging to either humans or animals. a) starved when main food source became limited b) learned to create and control fire for warmth during cold weather c) switched to eating what was available when main food source became limited d) had no ability to control the environment

How is the central idea developed further? (a) the author elaborates on the treatments for allergies in adults and how they work. (b) the author quotes the reactions of experts and the methods used to conduct the study. (c) the author compares the different rates of food allergies shown in children and adults. (d) the author indicates the limitations of the study because of differences in health care.