Thursday, September 8, 2011

introduction of animal kingdom

The earth is full of living things and non living things. Living things have life in them but non living things do not have life in them.  Living things are of two types. They are Plants and Animals. These two are known as kingdoms. The animal kingdom are divided in two types on the basis of presence or absence of backbone. Backbone keeps the body straight. The two types of animals are invertebrate and vertebrate

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