Examlex
Vaccines approved for use are continually monitored and tested for ________ by the FDA.
Lignin
A complicated organic molecule found in the cell walls of numerous plants, contributing to their stiff and woody nature.
Cellulose
A complex carbohydrate that forms the primary structural component of plant cell walls and is indigestible to humans.
Xylem
The plant's vascular system responsible for transporting water and dissolved nutrients from the roots throughout the rest of the plant.
Liverworts
Non-vascular plants belonging to the division Marchantiophyta, among the earliest land plants.
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