animal kingdom



  • porifera, coelentreta, ctenophora, platyhelminthes, aschalmenthis, annelida, arthropoda , mollusca, echinodermata, hemichordata, chordata

    arrange them on the basis of intracellular and extracellular digestion



  • @sri
    Sponges use intracellular digestion in individual cells; they are filter feeders and do not have a digestive system. They have water canals and a spongocoel for water to flow through, and the choanocytes absorb the food. Cnidarians use both intracellular and extracellular digestion.
    Extracellular digestion is a form of digestion found in all annelids, crustaceans, arthropods, and chordates, including vertebrates.



  • Like the Cnidarians, Platyhelminthes have a GVC, an incomplete digestive system. Free living worms, such as Planaria, use extracellular digestion. Parasitic Platyhelminthes, such as classsesTrematoda and Cestoda, use intracellular digestion, absorbing nutrients from their environment.
    Like humans, mollusks have a mouth, esophagus, stomach, and anus.thus show extracellular digestion
    In hemichordataExtracellular digestion occurs in anterior of intestine, intracellular digestion in hepatic ceca if present.
    Posterior intestine compacts remainder into fecal material for expulsion.


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