You are presented with the quiz "Plants are multicellular eukaryotes with cell walls composed primarily of what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plants are multicellular eukaryotes with cell walls made of cellulose" and "plant cell walls are composed primarily of lignin and cellulose". 

So, what's the best answer to the question?


 

      lignin     