Answer:
The correct answer is C. Temperature regulation (thermoregulation).
Step-by-step explanation:
The animal's ability to keep its internal body temperature constant at 35 degrees Celsius despite changes in the ambient temperature of its environment is an example of temperature regulation (C), also known as thermoregulation.
Temperature equilibrium (A) refers to a state where the temperature of the organism and the environment are the same.
Temperature feedback (B) involves a response to changes in temperature, but it does not necessarily involve the maintenance of a constant internal body temperature.
Temperature conformation (D) is a process where the internal body temperature of an organism changes to match the temperature of the environment, rather than regulating its internal temperature independently.
Therefore, the correct answer is C. Temperature regulation (thermoregulation).