Question

What do plants possess which the animals lack in??

Answer 1

Chlorophyll, lignin, cellulose, cell walls.

Explanation:

Chlorophyll, chloroplasts and any other photosynthetic parts
lignin, a structural component helps for the more dense rigid structures like wood
cellulose, also a structural component
cell walls which surround the plant cell and make it rigid but BEWARE bacteria have cell walls as well.
What else: roots, flowers, rhizomes in some plants.
Also starch. Plants make starch. As far as I know animals do not. But I could be wrong.