What purpose does the xylem serve in a plant

After fertilization, which type of cellular division is responsible for the growth and development of a complex, multicellular organism?

Two critical interventions to turn around the opioid crises are:

Recombinant dna is the merging of dna from unrelated organisms to create new genetic varieties is assembled in the lab from mononucleotides was part of the green revolution of the 1960s is pollination of one plant by another of the same species is cross-pollination of one plant by a different species