Find the odd one out. Give reasons for your choice:
filtration, respiration, secretion, excretion, reabsorption
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respiration
Reason — Except respiration, all are steps of urine formation.
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skin, heart, lung, liver, kidney
urea, salts, blood, carbon dioxide, bile
Why do we need to remove waste products from our body from time to time?
List the types of excretory products in humans.