Presentación proyecto Science. Vertebrates. 5ºC

1. AMPHIBIANS

2. Amphibians use their skin as a secondary respiratory surface.Some small terrestial
salamanders and frogs lack lungs and rely entirely upon skin.They are superficially
similar to reptiles but,along with mammals and birds, reptiles are amniotes and do not
require water bodies in wich to breed.

3. With their complex reproductive needs and permeable skins, amphibians are often
ecological indicators and in recent decades there has been a dramatic decline in
amphibian populations, for many species around the globe.The earliest amphibians
evolved in the Devorian Period from sarcopterygian fish.

4. Amphibians are ectothermic,tetrapod vertebrates of the class amphibia.They inhabit a
wide variety of habitats with most species living within terrestial,fossorial,aboreal or
freshwater aquatic ecosystems.

5. Amphibians typically start out as larva living in water,but some species have developed
behavioural adaptions to bypass this.The young generally undergo metarmophosis
form larva with gills to an adult air -breathing from with lungs.

6. By
Sara Berrocal,
Claudia Martinez,
Daniel Amador
And
Alexis Ale
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