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Sclerenchyma, xylem and phloem - Coggle Diagram

- - - - Living cells joined end to end to form sieve tubes. The 'sieve' parts are the end walls, with holes to allow the solutes to pass through.
    - - Sieve tube elements have no nucleus and few organelles- thus there's a companion cell for every sieve tube element
        
        Companion cells carry out living functions for both themselves and their sieve cells e.g. provide the energy for the active transport of solutes