15. Please answer this

Dear Student 

Kidneys are involved in the process of purification of blood and concentration of the waste products to form the urine which is excreted out of the body. The major purpose is to remove all the waste and toxins from the body in concentrated form with minimum loss of water along and maximum absorption of the nutrients. 

Therefore the kidneys are involved in the Excretion process. 
Option C is correct. 

Regards

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Dear student,

The correct option is C) excretion

Kidney is the part of excretory system. It is located at the rear of the abdominal cavity. Its functions are:

- It filters blood and remove harmful substances from the body in form of urine.

- It prevents the loss of essential nutrients by reabsorbing them after blood filteration.

- It secretes different hormones also.

Regards
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