Wednesday, May 29, 2013

What are cartilaginous fish

1. What makes cartilaginous fish different from other fish? Give examples.
-their Skeletons are made of cartilage.

2. List examples of cartilaginous fish.


3. What is special about the sharks eye?
-they have good vision in dim light. their pupil can dilate and contrast to control the incoming light.

4. What are the differences between bony fish and cartilaginous fish:
a. Heart and Blood - Sharks have fewer red blood cells,sharks have no bone marrow
b. External features - Shark skin is covered by dermal denticles. Bony fish are covered in flat scales.
c. Digesting and Evacuation - Bony fish have two seprate openings, sharks have only one opening called the cloaca.

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