Shark's also a fish
Very active predator
Adapted to hunt.
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Sharks have strong bodies
Skeleton of cartilage
Not a bone at all.
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Thrived as predators
Have unique adaptations
Body very light.
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Because of light weight
Faster and more flexible
Millions of years.
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Lacks a swim bladder
Buoyant from oil-filled livers
Also wing-like fins.
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Dermal denticles
Tiny tooth-like scales, no drag
Quiet, effective.
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Grow replacement teeth
Thirty thousand per lifetime
New rows replace old.
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Electroreceive
Ampullae / Lorenzini
Small pores on their snouts.
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Sharks can detect the
Minute electrical fields
Prey's muscle movements.
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Some sharks do lay eggs
(Oviparity); Live young,
(Viviparity).
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Hatch internal eggs
(Ovoviviparity)
Sharks' other method.
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Fourfifty mil years
Sharks predated dinosaurs
Five mass extinctions.
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Great White, higher temp
(Regional Endothermy)
Warmer than water.
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The Great White, having
Regional Endothermy
Hunts--colder water.
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Slow life history
Decade to maturity
Produce few offspring.
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Because few offspring
Sharks highly vulnerable
To overfishing.
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Apex predators
Essential for balance
Prey--healthy, diverse.
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Shark conservation
Meat considered low value
Often discarded.
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Fins are worth a lot
As ian shark fin soup market
Just cut off the fins.
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After fins taken
Cut from shark's living body
Carcass is thrown back.
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