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jueves, 3 de febrero de 2011

ARTHROPODS

Arthropod are invertebrates, they have articulatid limbs. They have their body divede into three parts. Some go through metamorphosis. Terrestrial arthropods breath through trache and aquatic arthropods breath through gills. They are devide into four groups insects, arachnids, crustacaens and myriapods.

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