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2015-11-23T19:44:31+05:30

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1)Animals have jointed appendages .

 2)Exoskeleton is present which is made of chitin.

3)Circulatory system is open, which means blood flows in the coelomic cavity.

4)This is the largest group of animals; in terms of number of species. 

5)They breathe through trachea

6)They are bilaterally symmetrical

7)They are triploblastic organisms

8)Examples are honeybee,spider etc

Thats why cockroaches are included in arthropoda 
2 3 2
last point is not needed
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