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What are the disadvantages of a flatworm's digestive system having only one opening?
Wiki User
∙ 12y ago
They cannot eat continuously (there mouth and anus are present in the same opening)
Wiki User
∙ 12y ago
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Which organism uses the same opening for ingestion and egestion?
Organisms that have only one opening in their digestive tract through which food enters and waste exits are known as having an incomplete digestive system. Some organisms with incomplete digestive systems are jellyfish, sea anemones, flatworms, and corals.
Flatworms are characterized by having....... A. a central nervous system B. radial symmetry C. tentacles for filter feeding D. a complete digestive system?
central nervous system.
What do flatworms have that sponges and cnidarians dont?
Flatowrms have muscle cells, they are a triploblastic phylum. They have endo, meso and ectoderm layersSponges are Parazoa and lack any true tissue at allCnidaria are diploblastic, having only endoderm and ectoderm
What are the significance of an animal's having two separate opening to the digestive tract as seen in Ascaris?
Some animals have only one opening (e.g. starfish), but having two openings (input and output) permits a long "disassembly line" type of processing of food that more efficiently extracts nutrients.
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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.
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