Flatworms (phylum Platyhelminthes) are simple animals that are slightly more complex than a cnidarian. Roundworms (phylum Nematoda) have a slightly more complex .
How are roundworms and earthworms similar?
The earthworm and roundworm have no respiration system. Both types of worms take in oxygen through the skin and give off carbon dioxide.
Are earthworms related to roundworms?
Invertebrate animals commonly called "worms" include annelids (earthworms and marine polychaete or bristle worms), nematodes (roundworms), platyhelminthes (flatworms), marine nemertean worms ("bootlace worms"), marine Chaetognatha (arrow worms), priapulid worms, and insect larvae such as grubs and maggots.
What do roundworms and segmented worms have in common?
All of them are invertebrates. They all have long, narrow bodies without legs. All worms also have tissues, organs, and organ systems.
How are roundworms and flatworms similar?
Similarities Between Flatworms and Roundworms Both flatworms and roundworms are multicellular, mobile, invertebrate animals. Both flatworms and roundworms are heterotrophs. Both flatworms and roundworms show bilateral symmetry. Both flatworms and roundworms show organ level organization.
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