Which statement about extracellular structures (plant cell walls and the extracellular matrix of animal cells) is correct? See Concept 6.7 (page).
a) Plant cell walls are primarily composed of chitin.
b) The extracellular matrix of animal cells provides rigidity and structural support.
c) Both plant cell walls and the extracellular matrix of animal cells are composed of cellulose.
d) The extracellular matrix of animal cells is primarily composed of lignin.