D. A change in the amount of polar ice will alter how ocean currents move
The best description about the brain stem is: it is the most important organ of our body's survival. It connects the brain and the spinal cord, controls the vital organs like the lungs and heart and it also coordinates the many essential body reflexes.
The answer is sediments because sediments break down and are every where on earth also break down due to weathering
Wenger used the shapes of the continents as puzzle's pieces and how they fit perfectly together.
