The answer is letter d, it is because when a person becomes obese, he or she is likely to intake small amounts of food if he or she wants to maintain his or her weight and if the person does not want to gain weight anymore and than it is more different when gaining weight or when the person was in the point to become obese because he or she has ingested more food to gain weight.
I think it the answer is C ( The relationship between the bacteria and the ticks is commensalism, and the relationship between ticks and humans is parasitism. -- Alina (:
