why do only animals require a digestive system ?

Animals require a digestive system because they take food in the form that body cannot directly utilize. The food needs to be broken down into form that body can utilize. Therefore digestive system becomes very important animals. There are various other organisms apart from animals that possess a digestive system For example amoeba has food vacuole that helps in digestion. 

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Animals need digestive system to obtain nourishment from food but some animals did not require it.,

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