Compare a small animal that soaks up food from its external environment with an animal with a tube type digestive system.What is/are the major advantage(s)of having a tube?

A)it isolates the food the organism ingests.
B)it permits development of specialized enzymes and concentration of digestive juices in different regions.
C)it permits more time for chemical action.
D)additional physical cutting and grinding of the food bolus is made possible.
E)All of the choices are advantages.