Final answer:
Homeostasis is the process by which the body maintains stable internal conditions and contributes to the equilibrium of various body functions. So, the correct answer is option d.
Step-by-step explanation:
Homeostasis is the process by which the body maintains stable internal conditions. It helps maintain equilibrium of various body functions throughout the body. For example, if the body temperature drops too low, the mechanism of balance, such as shivering, helps raise the temperature back to normal.
Another example is the regulation of blood glucose levels. When blood glucose levels rise too high, the mechanism of balance, such as the release of insulin, helps bring the levels back to normal.
In summary, the mechanism of balance in homeostasis helps maintain stable internal conditions and ensures that body functions remain within a certain range, contributing to the overall equilibrium of the body.
So, the correct answer is option d.