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1.What we call the maintenances of constant internal environment of organisms? __________________________


2. Animals which control their body temperature at constant state regardless the changes of external temperature are known as ______________


3. What is the organ in our body which is used as an excretory organ and also used as an organ of osmoregulation?
________________


4. What is the part of the kidney from which urine is taken through the ureter?
_____________________


5. The structural and functional units of the kidney is _______________________.