English
Русский
Oʼzbek
Subjects
News and articles
О нас
Карьера
Контакты
Profile
Watch history
My library
Notifications
Logout
Русский
Oʼzbek
Online Mektep
Authorization
Home
Subjects
Biology
Main
Subjects
Biology
Man as a species
Excretion
Excretion
Excreting Waste Products of Metabolism
Structure of the Excretory System
The urinary organs
The Diseases and Hygiene of the Excretory System
