Answer:
Option). shivering.
Step-by-step explanation:
Homeostasis can be defined as maintaining the steady state of chemical and physical conditions by living organisms. Shivering is one way to achieve homeostasis as it maintains internal body temperature.
The average internal human body temperature is 98.6 F. A drop in body temperature is detected by nervous system that triggers muscle contraction to start shivering. Shivering increases body temperature by producing heat and restores homeostasis.
Thus, the correct answer is option). 'shivering.'