Indicate Whether Each of the Following Descriptions Better Applies to the Plant

Short Answer

Indicate whether each of the following descriptions better applies to the plant cell wall (W) or the extracellular matrix of animal cells (M). Your answer would be a three-letter string composed of letters W and M only, e.g. WMM.
( ) It is generally thicker and stronger.
( ) It is more rigid.
( ) It has higher nitrogen content.