nematodes, annelids, and mollusks
Posted by angel beks on February 4, 2006
Q: what are some of the advantages of possessing a two opening digestive tract?
A: Wow, that's the first time I've had a question like this one! You're going to really make me think!! Seems to me that there is one main answer to this. I would have to say that the most important advantage of having a two-opening digestive tract is that it is much more efficient. Organisms that must expel undigested material from their digestive tract from the same opening that they consume food through are going to be less efficient at feeding than those organisms that can both eat and evacuate at the same time. If we use humans as an example, we know that we can eat a meal at noon while our breakfast is still being digested by our body. Hope this answer helps. Thanks for an interesting question.
John Wiessinger ( February 5, 2006)