Animals swim because they have these special structure, and this are the fins and tails, but they cannot swim if they cannot breath under water and this is called gills.
It really depends on the type of animal you are talking about. If you are takling about a shark or fish. Then, see above. If you are talking about an animal such as a hippopotums then they simply do what we humans call a 'Doggie paddle' they use their legs to basically 'Walk' through the water.
these organisms can swim,are kind of small,and are bascly like a fish.
There are many differeces between chondrichthyes and osteichthyes. Chondrichthyes means "cartilaginous fishses", in fact their skeleton is made up of cartilage, while osteichthyes, which means "osseous fishes", have an osseous skeleton, but there are other differences: chondrychthyes have many branchial fessures, different reproduction, lack of swim bladder, and many others.
Chondrichthyes, or cartilaginous fish like sharks and rays, move in the water by using their powerful tail muscles to create thrust and propel themselves forward. They also have streamlined bodies and pectoral fins that help them maneuver and control their direction as they swim. Additionally, some species of chondrichthyes can adjust the position of their pectoral fins to generate lift and maintain buoyancy.
No, chondrichthyes are fish that have skeletons made out of cartilage instead of bone.
Chondrichthyes
The main difference between Agnathans (jawless fish) and Chondrichthyes (cartilaginous fish) is the presence of jaws. Agnathans lack jaws, while Chondrichthyes have well-developed jaws. Additionally, Agnathans have a cartilaginous skeleton, while Chondrichthyes have a skeleton made of cartilage.
An organism in the class chondrichthyes has a shiny gloss of nutrition on it.
Chondrichthyes
they breath with lungs
Chondrichthyes
skin
chondrichthyes