I believe it is the cell membrane!
Animal Cells
Cholesterol is a substance that is found in animal cells but not in plant cells. It plays a key role in maintaining the structural integrity of cell membranes in animals.
The cell wall is located just outside the cell membrane of plant cells. The cell wall is made of a substance called cellulose and is not found in animal cells.
there are cells in the animals hair
A cell wall.
A leaf
Plant cells have a cell wall around the outside, but animal cells only have a cell membrane.
cell walls are in plant cells outside of the membrane, while animal cells don't have a wall, only a membrane.
cell wall
protoplasm
The outside covering that all plant cells have and that is not found in animal cells is called a cell wall. The cell wall provides structure, support, and protection to the plant cell, allowing it to maintain its shape and resist mechanical stress.
The outside "shell" of a animal or plant shell actually differ. Plant cells have two outer coverings, they have a cell wall and a cell membrane. Animal cells have only a cell membrane.