• tracheids are made up of elongated dead
cells with large cavities without any contents.
The cells are placed end to end forming a long
tube. They have highly lignified cell walls. They
provide mechanical support by developing
various types of thickenings in their walls,
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Xylem
Xylem is one of the most common plant tissues preserved in fossils and as a result, much of the research into fossil plant physiology deals with the relationships between xylem and the physiological characteristics of plants
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