Question

autographs lack digestive system while herbivores and carnivorous have one. justify

Answer 1

Autotrophs prepare their own food from inorganic materials. They do not need to consume food from outer sources thus they lack digestive system.
While on the other hand herbivores and carnivores intake food from outside thus they need a specialised digestive system to convert the food in to a form from which they can produce the required energy needs.
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Answer 2

Answer:

Autotrophs prepare their own food so digestive sysytem is absent in them. Whereas herbivores and carnivores depend on plants and animals for food. Thus the complex food has to be broken down into simpler form so that it can be absorbed by their bodies.