Gills are found in

Pharyngeal gill-slits are found in

Pharyngeal gill-slits are found in

Pharyngeal gill-slits are found in

Pharyngeal gill-slits are found in

Pharyngeal gill-slits are found in

Book gills for respiration are found in ?

Respiratory organs like gills, book gills, book lungs or tracheal system are found in phylum

Respiratory organs like gills, book gills, book lungs or tracheal system are found in phylum (a) Arthropoda (b) Aschelminthes (c) Mollusca (d) Chordata

Number of gills found in osteichthyes is

Number of gills found in osteichthyes is