What is the advantage of a tubelike digestive system over a saclike digestive system?

Answer 1

One advantage of having a tube-like digestive tract is that digestive processes with different requirements (for example, an acidic or basic environment) can be separated within the tract.

Because food moves along the alimentary canal in a single direction, the tube can be organized into specialized compartments that carry out digestion and nutrient aborption in a step-wise fashion.

Answer 2

Simple organisms like jelly fish have a sack-like digestive system. That is to say that their mouth and anus are the same orifice (some would say the same of politicians...). The simplicity of this arrangement does not allow for a sequential digestive process as in vertebrate species where different nutrients are differentially extracted during the course of digestion. For example, simple starches are broken down already in the mouth, while protein and fats are extracted in the small intestine. Since the process is both specialized and transit time is longer a tube like system more completely recovers nutrients than would a sack like system.

Answer 3

the food goes through the system more fast, then a saclike digestive system. Like earthworms, all they eat is dirt so yea

acctually worms don't only eat dirt. they also eat potato peels, carrots, coffee grinds with the filter, teabags, orange rinds, and other fruits and veggies.