Skeletons are made from cartilage
Examples of cartilaginous fish?
Sharks, Rays, Chimeras
What is special about sharks eyes?
They can protect their eye with a tough third eye lid
Difference between cartilaginous and bony fish?
a)Blood and heart
Sharks have larger and fewer blood cells
b)External features
Shark skin is covered by dermal deaticles
Bony fish is covered by flat scales
c)Digestive evacuation
Sharks kidneys and genitals empty into one opening
Bony fish have two, rectum and anus
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