When you become too cold, your hypothalamus will signal what parts of your body to raise the temperature?

What is the name for a substance formed in a chemical reaction

Match each description to the appropriate biome. tropical savanna desert tropical rain forest taiga tundra has sparse vegetation and very cold temperatures located near the equator and contains trees that form dense canopy layers is very hot and dry, and has plants that need little water has cold winters, heavy snowfall and is dominated by conifers has warm temperatures and is dominated by grasses

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?