SCORPIONS
For the scorpion, digestion begins outside the mouth. The food is semi-digested by digestive juices that are supplied to the preoral cavity by the gut, before it enters the scorpion's mouth. Setae, which is in the preoral cavity, filter indigestible material such as prey exoskeleton. These indigestible particles are matted togehter and expelled. Food passes from the mouth to the pharynx to the esophagus to the mid gut to the hind gut and is finally expelled through the anus. Drawing food into the body, the muscular pharynx acts as a pumping organ. Excretion wastes are expelled through the anus with feces.
ANTS
When food is eaten, it passes on to the food pouch.This is where the juices are squeezed out of the food.The ant swallows the juice and spits out the solid part.The liquid goes to the crop,or social stomach.An ant will spit out from its crop to feed other ants. Some food goes to the mid-gut where its digested. The undigested food passes out of the rectum.
FLIES
Flies only eat liquid food, which they take up with their mouth-parts that are similar to a sponge. The food passes through the gut and it is first digested and then absorbed; the last portion is the hind-gut where water is reabsorbed. Their gut has blind-end ramifications so they can store small amounts of liquid food to digest later.