You are presented with the question "Damage to the structural units of the kidneys can be caused by  .." and the following answer choices: 
- harmful substances
 - an area swollen with pus
 - a lot of human deaths
 - Pesticides
 - Heavy rains
 - Leptospirosis
 - Veins and arteries.
 - high blood pressure

Now knowing that nephrons are the structural and functional units of the kidneys and damage to the nephrons can be caused by conditions such as diabetes and high blood pressure , choose the best answer.


 

        high blood pressure 