a cell wall is a part of a plant cell for supporting and protecting the cell membrane & a plant is made of plant cells ->  plant cells have cell wall to support and protect the cell membrane  a pine tree is a kind of tree & a tree is a kind of plant ->  a pine tree is a kind of plant  a pine tree is a kind of plant & a plant is a kind of organism & a plant is made of plant cells ->  a pine tree is a kind of organism that is made of plant cells  plant cells have cell wall to support and protect the cell membrane & a pine tree is a kind of organism that is made of plant cells -> a pine tree is the organism that is made of cells with cell wall