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1.Skin:provides protection from mechanical impacts and pressure, variations in temperature, micro-organisms, radiation and chemicals.

2.Lungs: converts deoxygenated blood to oxygenated blood.

3.Liver: converts dangerous wastes into urea.

4.Kidney: filters the blood before sending it back to the heart and also produces urine.

5.Ureter: transport urine from kidneys to the bladder.

6.Bladder:stores urine.

7.Urethra:carries urine from bladder to outside the body.

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1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint