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We are vertebrate  and placental mammals
Some main characteristics are :
-Have little hair
-Femail develope mammary glands
-Our skin has many sweat glands
-We are biped (two back legs )

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CARTILAINOUS : have a skeleton made of cartilage
BONY : have skeleton make of bones

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-They are tetrapods
-They have thin , moist skin
- They have a sticki mucus produce by grands under their skin helps them to stay moist
- they reproduce by metarmophisis

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-They are cold-blooded
-They breath mainly through their skin
-The majority of amphibians are carnivores
-They are oviparous

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-Their body temperature changes according to the temperature of their enviroment
-Fish take oxygen dissolved in the water into their bodies through the gills
- The majority of fish ar carnivores
-They reproduce by laying eggs

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-They have strong muscle wich propel thei bodies as they swim
-Their bodies are smooth and is covered with scale
-Their libms are fins that allow them to swim

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-They are cold-blooded
- They breath through lungs
- They are carnivores and oviparous

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- They are terrestial vertebrates
- Their scaly skin is tough and dry they have scale made from keratine protect of injuries and dehydration
- They are tetrapods

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- Are endothermic
-Breath through lungs
-Very varied eating habits
-They are viviparous
- Have a very developed nervous system

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- They have different kinds of glands and they produce milk
- They are covered by hair
- Mammals are tetrapods

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-They are endothermic
-They breath through lungs
-Their are eating habits are varied
-They lay eggs

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- They do not have teeth they have a beak
- They have wins and feathers
- Their bodies are fusiform
- They are bipeds