* Cork: Made of cells. Cork is actually the bark of a cork oak tree, and its cells are filled with a substance called suberin, which gives it its unique properties.

* Sponge: Made of cells. Sponges are simple animals made up of many specialized cells.

* Wood: Made of cells. Wood is primarily composed of the dead cells of trees, specifically the xylem tissue.

* Plastic: Not made of cells. Plastic is a synthetic material made from petroleum products.

* Tree: Made of cells. Trees are living organisms composed of many different types of cells, including xylem, phloem, parenchyma, and more.

Let me know if you have any other questions!