Question

How is complete digestive tract different from incomplete digestive tract?

Answer 1

1. Incomplete digestive system - Comprises a digestive cavity having only one opening which acts as both mouth and anus.
2. Complete digestive system - Comprises of digestive tract having two openings i.e. mouth and anus.

Incomplete digestive tract	Complete digestive tract
1) Less complicated animals have an underdeveloped digestive system because they lack digestive tracts and organs.	1) The entire digestive system is made up of digestive tracts and organs. This system also totally digests the meal.
2) Simple animals such as jellyfish and sponges serve as excellent examples.	2) Animals such as dogs, cats, humans, amphibians, fish, and birds serve as the best examples.
3) They only have one mouth opening for food and excretion.	3) The waste materials are expelled by the anus after the digestive process. Humans and complex animals both have this system.
4) The central pore's function is to convey food and waste.	4) The waste is ejected via a separate organ known as the anus.