nothing
Gills
The respiratory system of a perch involves extracting oxygen from the water. Frogs can extract oxygen from water and air while pigeons and pigs can only breathe in air.
how does the respiratory system work
how does the respiratory system work
The Respiratory system is very closely linked with the circulatory system.
respiratory system
no
If the respiratory system is not working, nothing is working.
Respiratory system of all lizards is alike .
The respiratory system
Oxygenation of blood
Circulatory system