The sclerenchyma is the tissue in which creates the plant firm and hard. The two kinds of sclerenchyma cells exist fibers and sclereids. Their cell walls be made up of cellulose, hemicellulose and lignin. The sclerenchyma cells are the principal associate cells in plant tissues that have come to a close elongation.
<span>The tracheae possibly have evolved directly from the book lungs</span>
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Cordon and search is a military tactic to cordon off an area and search the premises for weapons or insurgents.
