Your heart muscle needs its own supply of blood because, like the rest of your body, it needs oxygen and other nutrients to stay healthy. For this reason, your heart pumps oxygen-rich blood to its own muscle through your coronary arteries.
Central nervous system. and automatically nervous system .it is mainly spinal cord system of the body.
When altitude increases, air temperature decreases because when there is an increase in altitude, there is a decrease in air pressure. When air pressure decreases, air cools down. Latitude affects temperature because the closer you are to the equator, the more intense the sun will be.
Biotic-the decrease of fish can Make the bear population decrease
abiotic-A rapid change in the temperature can make the bear population decline
