Sclerenchyma cells: A. have unevenly thickened cell walls. B. have thin primary cell walls. C. make up the bulk of most plant tissues. D. are dead at maturity.

Answer: A and D

Explanation: Sclerenchyma cells are thick cells that provide support in plants. They have thick cell walls lined with lignin. They possess extremely thick cell walls which gives rigidity and support to the plant body. Their main and primary function is to give support and structure to the plant.

Sclerenchyma cells don't have protoplast that mean the cells are dead at maturity.