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the tube that carries urine from the nephrons to the ureter via the renal pelvis.
a hard granule of crystallised minerals which forms in the kidney.
the second biological classification group (taxon) that is divided into phyla (for animals) or...
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and...