1) The excretory product in humans and animals  a) urea b) blood c) oxygen 2) The process by remove waste product of metabolism a) excretion b) respiration c) reproduction 3) kidney part to store urine before taking out from our body a) ureter b) kidney bladder c) urethra 4) 95% urine is water, is that mean urine is sterile? a) doubt b) no c) yes 5) Too much protein can be toxic and we can not keep a surplus of protein and amino acids in our bodies. a) yes b) no c) doubt

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