How many bones does an adult human have? Why do you THINK we need so many bones?

206 bonesWe have these 206 bones distributed in different parts as per the reuirement..Bones support body structurally,protect our vital organs,allow us to move...Also,bone provide environment for bone marrow,where blood cells are created and they act as a storage area of minerals.

(Bonus: femur is the strongest bone and longest bone of human body)

looks like the answer is     c     to me!

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.