Why are temperate regions cooler than the tropics? a. the midlatitudes are farther away from the sun than the tropics
b. the sun hits the midlatitudes at an angle instead of directly
c. the mid latitudes have more cloud cover than the tropics
d. the midlatitudes are always partially covered in ice, which keeps them cooler

Red blood cells are responsible for transporting oxygen in the blood. people with sickle cell anemia were born with a defective gene that results in sickle-shaped red blood cells. individuals with the disease often suffer pain in their extremities due to the build-up of these cells causing blockages in the blood vessels. the shape of the blood cells also reduces the amount of oxygen transported in the blood.