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1. export and import

2.their body parts used for selling

3.their body system is disturbed for high production leading to increase the death rate of animal 

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The various causes are-
1> Animals are being used in researches in Medical Sciences
2> They are used for making certain type of drugs
3> The skin of animals is used in making leather
4> The higher economic value of a particular body part of an animal. eg. teeth of elephant, skin of tiger and deer, etc
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