4. A sclerenchyma cell must be very strong to function, so it has a
(A) Primary wall only
(B) Primary wall, plus a secondary wall that contains only cellulose
(C) Primary wall, plus a secondary wall that contains cellulose and hemicelluloses
(D) Primary wall, plus a secondary wall that contains cellulose, hemicelluloses, and lignin
(E) Secondary wall only
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統計: 尚無統計資料
統計: 尚無統計資料