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Water transfer oxygen to the blood when it passes through the gills , adn carry away carbon dioxide .

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- little hair
- plentiful in some areas  , such as the head
-  females develop mmamary glands
- our skin has many sweat glands
- we walk on two legs  , bipeds
- brain size is very large
- we communicate with individuals of our own specie

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Humans being are vertebrates and placental animals . Human babys born completely developed but , in contrast to other animals , they are totally defenceless . They have to be look after by afults for many years .

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- Carnivores : consume food that comes from other animals . Carnivores that hunt for their food are called predators .

- Herbivores : feed on plants or seaweed  . Many herbivores eat grass but other consume seeds , fruits , flower nectar or even wood , such as termites .

- Omnivores : feeed on both , plants and animals .

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Metamorphosis in amphibians is the transformation of the larva to a miniature adult replicate, and usually from an aquatic to a terrestrial or semi-terrestrial lifestyle. Metamorphosis marks the beginning of the end of larval life.

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Viviparous animals are those that are born from inside the pregnant parent, unlike oviparous animals that are born from eggs incubated outside.

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The 5 gruops of vetebrates :

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Animals with a backbone and an endoskeleton or ' internal skeleton ' . Fish , amphibians , reptiles , mammals , birds are the 5 vetebreates groups .

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Body temperature change by the temperature of their environment , the majority of fish's are carnivore , they all are oviparous , oxygen dissolved in the water and get into their gills

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Their backbone :

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They are cold-blooded , they breath mainly through their skin , also they can through their lungs . Majority are carnivores , tapdoles , are herbivores . They are oviparous and some amphibians have poison skin

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Bacbone :

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They are ectothermic or cold-blooded , they breath through lungs , theyvare oviparous , many are carnivores . Some have glands with poison

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Backbone :

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They are endothermic , they breath through lungs , they are oviparous , their eating habits are varied

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Endothermic animals , breath through lungs , they are viviparous , very development nervous system , they can be carnivores , herbivores , omnivores

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Backbone :