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Perch have complete digestive systems
The digestive tract is renewed every 3-5 days.
Bacteria.
complete. The crayfish has both a mouth for ingesting food and an anus to expel the waste.
That wavelike movement of the digestive tract is known as peristalsis.
Perch have complete digestive systems
yes!
Mammals have a complete digestive tract, it starts from mouth to anus. Although each species have some different type and length of tract, they have esophagus, ventriculus, intestinum which function to support a complete food metabolism. Besides, some digestive glands also support this function.
The digestive tract is renewed every 3-5 days.
They have complete digestive system.
Annelida
Bacteria.
Leeches have a complete digestive tract. Leeches are members of Phylum Annelida. This phylum has the general characteristic of having a complete digestive tract, i.e. food goes in through the mouth, pass through digestive tract of some sort like stomach and/or intestine, waste gets discarded through some sort of rectal opening, i.e. anus. In comparison, an incomplete digestive tract generally means food goes in and waste come out of the same opening, i.e. mouth=anus. Lower level invertebrates have incomplete digestive tract like Phylum Cnidaria and Phylum Platyhelminthes members.
The stomach
A gastrovascular cavity is a digestive sac with only a single opening. A complete digestive tract (otherwise known as an Alimentary canal) has two openings (a mouth and anus) between its digestive tubes unlike the gastrovascular cavity in which food is ingested and eliminated through the same opening (example would be hydra)
aschelminthes
The anus is the last part of the digestive tract.