Answer: 4. The kidneys remove excess water from blood.
Explanation:
Homeostasis is the ability or quality of the body to regulate and maintain it's internal environment constant with respect to the changes occurring in the external environment. This makes the organism survive in the changing environment. Maintaining the temperature, pH, blood pressure, controlling the fluid balance all are example of the homeostasis.
The kidneys remove excess water from the blood along with the excess water many impurities and wastes are removed from the body by the process of urination. This way kidneys purifies the body by excreating wastes.
Explanation: the ice age posed a new chalenge to deer mice and on the ice the preadators could spot the darker deer mice better than the light deer mice.
