Here's why:

* Cell Membrane: All cells, both plant and animal, have a cell membrane. It's the outer layer that controls what goes in and out of the cell.

* Chloroplasts: Chloroplasts are organelles found in plant cells that are responsible for photosynthesis. Animal cells do not need to photosynthesize, so they don't have chloroplasts.

* Cell Wall: Plant cells have a rigid cell wall made of cellulose that provides structure and support. Animal cells do not have a cell wall. They rely on their internal cytoskeleton for support.