These dark areas are called maria. They are thought to be formed by volcanic eruptions in the moon's history.hope this helped:)
They help work together because when the heart pmps blood through the body and the cells flow through the blood non stop its like a barrier of protection
You're answer would be B) Terrae.
Hope this helps,
♥<em>A.W.E.<u>S.W.A.N.</u></em>♥
