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~They have a great diversity of species
~Human beings are also mammals

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~They are endothermic
~They breathe through their lungs
~They hace carnivores, omnivores and hervibores
~They are viviparous
~They have developed nervous system

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Marsupials
They are viviparous, but they don't develop the placenta

Monotremes
They are the only mammals that are oviparous

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They are 2 types of fish:
~Cartilaginous fish, have a skeleton made of cartilage like sharks.
~Bony fish, have a skeleton made of bone like a shed or a mullet.

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Fish take the oxygen dissolved in the water into their bodies through the gills. This are fillaments located on both sides of their head, protecded by a gill cover called operculum. Water comes through their mouth, passes to the gills and goes out again when the operculum opens.

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~They are ectothermic
~The majority are carnivores the rest are hervibores, omnivores ore eat the remains of other organisms
~They are oviparus

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Vital functions
~They are cold-blooded
~They breathe through their skin but they can also breathe through their lungs
~The majority are carnivores; tadpoles, however are hervibores
~They are oviparous

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Metamorphosis is the developmental process some animals go through from birth to adulthood as they grow.

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This Is How a Tadpole Transforms Into A Frog | The Dodo

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~They have a strong beak
~They have feathers
~They are bipeds
~Their bodies are fusiform
~They are endothermic
~They breathe through lungs
~Their eating habits are varied
~They lay amniotic eggs

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Vital functions
~They are ectothermic
~They breathe through their lungs
~Many are carnivores.
~Some have glands with poison
~They are oviparous