The primary source of energy that drives convection within the atmosphere and oceans is the sun.
Arteries carry blood (with oxygen) from our heart out to your body, while veins carry blood (without oxygen) from your body to your heart. Arteries are strong, flexible blood vessels that are able to expand (get bigger) and contract (get smaller). They expand as your heart beats, and contract between heart beats. Veins are less flexible than arteries. They have valves (doors) that open and close to let blood through.
The foramen magnum is really important feature for bipedal mammals (basically, animals that walk on two feet). It's basically a whole in the base of the skull that allows the spinal cord to connect the lower body to the brain. Hope this helps!
Answer: I think the best answer would be C.
Explanation: I think that is correct.
