1.What makes cartilaginous fish different from other fish? Give examples
One of them is ‘Class Chondrichthyes’, which includes sharks, rays and chimeras. This class of fish is also known as ‘cartilaginous’ fish because they have skeletons made of cartilage. The other class is ‘Class Osteichthyes’, which gave rise to the modern day bony fish, also called ‘teleost’, and their primitive relatives such as the sturgeon. Although the two groups once shared a common ancestor, there are several major biological differences between them.
2.List examples of cartilaginous fish.
Bony fish
Shark
Bony fish
Shark
3.What’s special about a shark’s eye?
Shark species have eyelids and some can even protect their eye with a tough third eyelid called a nictating membrane. Other species, like the great white shark, have muscles that can roll the eye back into the socket for protection. Bony fish lack eyelids or the ability to protect their eyes.
Shark species have eyelids and some can even protect their eye with a tough third eyelid called a nictating membrane. Other species, like the great white shark, have muscles that can roll the eye back into the socket for protection. Bony fish lack eyelids or the ability to protect their eyes.
4.What are the differences between bony fish and cartilaginous fish:
a.Heart and blood
b.External features
c.Digesting and evacuation
No comments:
Post a Comment