Final answer:
Behavior in animals is influenced by various stimuli, triggers, and the involvement of specific structures and functions. It can develop through innate characteristics or experiences. The evolution and function of behavior are closely connected to the fitness and survival of the animal and the species. Comparative studies can reveal similarities and differences in behaviour across related species.
Step-by-step explanation:
The topic of the question is animal behaviour in biology. In response to question 1, the behaviour is caused by various factors including stimuli, triggers, and the involvement of specific structures and functions within the animal's body. For question 2, behaviour can develop in different ways - it can be innate and present early in life, or it can appear as the animal matures. Certain experiences may also be necessary for behaviour to develop. Question 3 focuses on the evolution and function of behaviour. It explains how the behaviour evolved and its impact on the fitness and survival of the animal and the species. Finally, question 4 aims to understand how the behaviour evolved, its comparison with similar behaviours in related species, and the ancestor in which it first appeared.