A semi-fossilized sample of plant tissue from an archaeological site contains long tubes of connected cells with secondary cell walls.They show signs of having been dead before the overall death of the plant from which they came.These are probably

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The presence of long tubes with secondary cell walls that were dead before the plant's overall death suggests that they are part of the xylem vessels, which transport water and minerals up from the roots to other parts of the plant. The other options, such as companion cells and sieve tubes, are part of the phloem which transports sugars and other nutrients throughout the plant. Pericycle cells are in the outermost layer of roots, and are responsible for producing lateral roots.

A Semi-Fossilized Sample of Plant Tissue from an Archaeological Site