Respuesta :
These might have been observed in the common ancestor of chondrichthyans and osteichthyans is a mineralized, bony skeleton.
What is chondrichthyans?
These fishes belong to the group of cartilaginous fishes called chondrichthyes, and their skeletons are mainly composed of cartilage. They are comparable to Osteichthyes, also referred to as bony fishes, whose skeletons are largely composed of bone tissue. Chondrichthyes, or jawed vertebrates, feature paired fins, paired nares, scales, and a heart with chambers arranged in series. All chondrichthyes species, from the 10 cm (3.9 in) finless sleeping ray to the 10 m (32 ft) whale shark, are still living today.
What is Osteichthyes?
Fish belonging to the taxonomic order Osteichthyes, also known as the "bony fish," have skeletons that are predominantly made of bone tissue. In contrast to them, the Chondrichthyes have skeletons that are predominantly made of cartilage.
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