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They have a coelom, a space between the skin of the roundworm that allows the organs to move around freely by themselves.

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How are earthworms and ascaris similar?

Annelids are segmented whereas roundworms are not. Annelids have a true coelom while roundworms have a pseudocoelom. Annelids have a more complex nervous system than roundworms. Annelids have a more complex circulatory system than roundworms.


What are three reasons earthworms are said to be more complex than roundworms please can you help me answer this qusetion?

the reason earthworms are more complex than roundworms is b/c they have muscles 2 move with,and have a nervous system and a digestive system.


What features distinguish annelids from roundworms?

There's many of them, but here are some of the bigger ones; Annelids, unlike roundworms (or flatworms for that matter) are segmented. That is after all how they get their name (annelida = little ring). Annelids also have a very complex organ system. Roundworms only possess a reproduction system as they usually live in an organism's intestines and don't need to digest food. Annelids posses both a reproduction system, and a digestive system as well as a circulatory system. As they are true coelomates their organs and organ systems are organised rather than just kinda' being tossed in there. =)


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Protists are less or more complex than bacteria?

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