Final answer:
A poor example of homeostasis is when an animal's temperature changes drastically during the day, as homeostasis involves maintaining stable internal conditions.
Step-by-step explanation:
The question 'Which of the following is a poor example of homeostasis?' concerns an understanding of how living organisms maintain stable internal conditions. The correct answer to this question is 'A. An animal's temperature changes drastically during the day.' because homeostasis refers to the maintenance of relatively stable internal conditions despite external changes. Thus, drastic changes in an animal's temperature during the day would indicate that the homeostatic mechanisms are not functioning properly to maintain a constant body temperature, which is contrary to the principle of homeostasis.
Option 'B. Body fluid pH stays the same in a bird.' and 'C. Blood temperature remains constant in a human.' are both examples of homeostasis in action, as they describe situations where key physiological variables are being regulated to remain within narrow limits, despite potential environmental changes.