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a gland which secretes substances, usually enzymes, through a duct directly to the part of the body where they are needed.
the complete set of alleles (different forms of genes) making up the genetic material of a...
consists of the pectoral and pelvic girdles together with the arms and legs.
unicellular organisms that do not have a proper nucleus or membrane bound organelles.
the branch of the renal artery which carries blood to the nephron, and branches to form the...
the nervous system outside the brain and spinal column.