Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
Yes, I think I have some genetic traits which is similar to my grandparents.
Explanation:
Genes are blue print of our body. The 25% gene of Grandparent is similar to their grandchildren. This gene effects the look. It may affect the color of hair and color of eyes.
Each gene is responsible for different change of our body. Genes pass from one generation to other so it is passed through grandparents to parents and reaches to us.
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the tail bone connects to the spine :)