1) not an excretory materials a) water b) undigested food c) carbon dioxide d) urea 2) excretes urea a) kidneys b) lungs c) liver d) skin 3) part of the kidney that contains kidney tubules a) cortex b) medulla c) pelvis 4) change amino acids to urea a) kidneys b) liver c) skin d) lungs 5) part of nephron where blood is filtered a) glomerulus b) tubules c) collecting ducts 6) part of kidney a) pelvis b) tubules c) glomerulus

excretion

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