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WE DIVIDE ANIMALS IN 2 GROUPS: VERTEBRATES and INVERTEBRATES

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WE DIVIDE ANIMALS IN 2 GROUPS: VERTEBRATES and INVERTEBRATES

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Animals, according to their physical structure can be: vertebrates or invertebrates.

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To clasify animals, we must find a characteristic they have in common, to separate them into smaller groups.

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They can be divided in the following groups: mammals, amphibians, birds, fish and reptiles.

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Their main feature is, they don’t have a spinal cord, no bones or a skeleton. Most of them are called bugs or insects.

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Most of them, walk or run, as the human being, some can swim for example, the dolphin. Some other fly, for example the bats.
Mammals have hair or fur on the body, mothers give birth to babies and feed them with their breastmilk.

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Most of them fly and live in the air, all their body is covered with feathers, they are born from eggs.

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Some of them crawl to go from one place to another, they have scales on their body and some have a shell, they are born from eggs.

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They live and breath under the water, most of them have fish scales on their skin, they have fins to swim, they are born from eggs.

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protozoans: single-celled organisms such as amoebas and paramecia.

annelids: earthworms, leeches

echinoderms: starfish, sea urchins, sea cucumbers.

mollusks: snails, octopi, squid, snails, clams.

arthropods: insects, spiders, crustaceans such as shrimp, crabs, lobsters.

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They can be terrestrial or aquatic, their skin is wet, they are born from eggs. Most of them can jump, even, their back legs are longer.