Why does the digestion of food in all the animals occur inside the body?

The digestion of food in all animals occurs inside the body to protect the organism from harmful pathogens and toxins that could be present in food. Internal digestion allows for a controlled environment where enzymes can effectively break down food into nutrients that can be absorbed and utilized by the body. Additionally, this process enables the efficient extraction of energy and essential nutrients while minimizing waste and potential damage to surrounding tissues.