In order to stay healthy, what must an animal’s body do?

In order to stay healthy, the animal's body must maintain homeostasis. Homeostasis refers to the process that living organisms, such as animals, maintain in order to acquire a fairly stable condition that is needed for survival. The word "homeostasis" comes from the Greek words which mean 
"Same" and "steady". This include in the control of body temperature, regulation of other physiological processes, management of stress, etc.

This question is an opinionated one, and we don’t know anything about the module or anything, thus we can not answer it. but if you are having trouble on what it is asking basically it is just asking to (using your knowledge on the topic) say which topics you were most interested and which were the most challenging.hope this : p