What is the BEST explanation for why a person shivers when their body temperature is "too cold"?
the shivering is caused by a decrease in the blood's pH level that raises the body's temperature
the shivering is caused by an increase in insulin production that raises the body's temperature
the shivering is caused by an increase in muscle contractions that release energy maintaining homeostasis
the shivering is caused by increased water reabsorption by the kidneys that raises the body's temperature