Concept:Hormones such as thyroxine and adrenalin regulate body activities, including behavioural responses.Explanation:Thyroxine controls metabolic rate and body temperature, affecting energy and activity levels.Adrenalin prepares the body for emergency reactions, such as fear or excitement.Together, these hormones influence the behavioural patterns of an organism.Blood grouping, tongue rolling, and colour variation are not directly controlled by these hormones.Answer:C. behavioural patterns