Evolution of the Sharks Digestive Tract

What does the sharks liver help with?
Buoyancy
Speed
Increases surface area
Absorbs nutrients
The dogfish has a swim bladder
True
False
What does the spiral valve intestine help with?
Allows them to eat more
Maximize the absorption of nutrients
Speeds up the sharks digestive system
Produces oil
How much does a ton of shark liver oil cost?
$300
$5,000
$10,000
$15,000
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