Unlike most fish, shark don’t have bones. Their skeletons are made of cartilage. It is lighter and more flexible than bone, which help sharks with bouyancy and maneuverability in the water. Most fish use swim bladder for bouyancy


Unlike most fish, shark don’t have bones. Their skeletons are made of cartilage. It is lighter and more flexible than bone, which help sharks with bouyancy and maneuverability in the water. Most fish use swim bladder for bouyancy
Shark test positif for cocaine in their livers and muscles in Rio De Janeiro affected by polluted waters
source :
The Washington Post