(a) What job is done by the kidneys ?
(b) What do kidneys excrete ?
(c) What is the name of the tubes which connect the kidneys to bladder ?
(d) What does the bladder in our body do ?

(a) The kidneys remove the poisonous substances like urea, other waste salts and excess water from the blood in the form of yellowish liquid called urine.
(b) Urea.
(c) Ureters.
(d) Urinary bladder is a bag which stores the urine temporarily till it is excreted out.