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 .