Answer
A.
Explanation:
All of them have an a and only two have a B. Thats my best guess
Answer:
youngest is top oldest is bottom
The Kidney would begin to fail
A cast<span> is a 3-D example of an object of the past created when a </span>mold<span> fills up with sediment like mud, sand or volcanic ash. </span>Fossils<span> can form when hard parts of a </span>fossil<span> are replaced by other minerals</span><span>.</span>