Jellyfish have a single opening that serves as both their mouth and anus.
Jellyfish
Sponges have specialized cells that allow them to expel waste without a dedicated anus.
Sponges
Some members of the cnidarian group, like corals and sea anemones, lack a separate anus.
Cnidarians
Flatworms
Certain flatworms use a simple system of branched tubes to distribute nutrients and expel waste.
Tapeworms
Tapeworms absorb nutrients directly through their skin, eliminating the need for a separate anus.
Roundworms
Nematodes have a complete digestive tract but often lack a distinct anus.
Comb Jellies
Some ctenophores have a single opening for both eating and waste expulsion.
Rotifers
These microscopic animals use a specialized structure called the "mastax" to process food and eliminate waste.
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