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region of the kidney into which urine is discharged from the collecting ducts of the nephrons, before being passed into the ureter.
animals with three cellular body wall layers: the ectoderm, mesoderm and endoderm.
the splitting of water molecules into oxygen atoms and energy-rich hydrogen atoms to be used in...
milky white lymph in the lacteal of the lymphatic system.
a social structure in which different classes are determined by heredity.
the complete set of alleles (different forms of genes) making up the genetic material of a...