Answer :

(a) Carbon dioxide is removed by exchange of gases during respiration by lungs.

(b) The undigested food is removed from the body by excretion, performed by the excretory system of the body. The food is removed through an opening called anus.


(c) Urine is also removed by excretion, by the kidneys. It is expelled out of the body by the urethra.


(d) Sweat is removed by sweat glands in the process of excretion.


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