Nephrons are the structural and functional units of the kidneys.
Damage to the nephrons can be caused by conditions such as diabetes and high blood pressure .
Damage to the structural units of the kidneys can be caused by  high blood pressure ..
Damage to the structural units of the kidneys can be caused by  ..
Options:
[1] harmful substances
[2] an area swollen with pus
[3] a lot of human deaths
[4] Pesticides
[5] Heavy rains
[6] Leptospirosis
[7] Veins and arteries.
[8] high blood pressure