Dark hard position of secondary xylem is called

Duramen - The central or inner dark coloured non-functional wood or secondary xylem, not takes part in the conduction of water is called Duramen or Heartwood.

dark hard position of secondary xylem is called Duramen

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nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides