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animal-like single-celled eukaryotes.
animal wastes (particularly urine) that contain materials high in nitrogen.
the tube through which urine passes from the bladder to the exterior.
the right and left halves of bilaterally symmetrical organisms are mirror images of each other...
the process whereby water and small molecules dissolved in the blood are forced out of the...
the parts and processes of the body that recognise and fight pathogens, such as viruses and...