Cells that are alive, have thickened cell walls, and support the plant body are:

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Collenchyma cells are living cells with unevenly thickened cell walls that provide structural support to the plant body, particularly in areas of new growth. Parenchyma cells are also living cells, but their main function is storage and photosynthesis. Sclerenchyma cells are dead at maturity and have thick, lignified cell walls that provide support and protection to the plant body. Phloem cells are involved in the transport of organic materials throughout the plant. Vessel members are also involved in transport, specifically of water and minerals.

Cells That Are Alive, Have Thickened Cell Walls, and Support