Skin temperature differs from core temperature because it:
Correct option is C, Changes with environment. In Thermoregulation, the accurate description is Changes with environment, and that is what you should commit to memory. Keep the definition tight and the role clear — cause and effect line up with Changes with environment — that is the mechanism or reason the stem is pointing to. Then Changes with environment is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Changes with environment.
Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.