Final answer:
The 'pinched in' area that forms at the end of cell division in animal cells is called the cleavage furrow.
Step-by-step explanation:
At the end of cell division, animal cells begin to pinch in at a region known as the cleavage furrow. During cytokinesis, which is the final stage of cell division, a contractile ring composed of actin filaments forms just beneath the plasma membrane. These actin filaments contract, pulling the cell's equator inward and creating a fissure known as the cleavage furrow, which deepens until the cell is divided into two daughter cells.
In animal cells, at the end of cell division, the area that begins to pinch in is called the cleavage furrow. It is formed by a contractile ring composed of actin filaments, which pulls the equator of the cell inward. The furrow deepens as the actin ring contracts, eventually leading to the division of the cell into two daughter cells.