Final answer:
The correct statement about extracellular structures in plant cell walls and the extracellular matrix of animal cells is that proteins and lipids are common components of extracellular structures.
Step-by-step explanation:
The correct statement about extracellular structures in plant cell walls and the extracellular matrix of animal cells is that proteins and lipids are common components of extracellular structures. In plant cell walls, the major organic molecule is cellulose, while in animal cells, the primary components are glycoproteins and collagen. These extracellular structures provide structural support, help maintain shape, and allow cells within tissues to communicate with each other.