Round+worms

__**Digestive system-**__ **Erika** Round worms have a definite digestive system that runs through their whole body. Included in digestion there is a mouth, a pharynx, an intestine, and an anus. This type of system is a major adaptive jump from the sac-type, single opening digestive system that is found in the flatworm. __**Nervous system-**__ **James**
 * Round worms**

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Roundworms have two cords that send impulses to itself. Roundworms have a ganglial nervous system with an anterior neural ring that represents a primitive cephalization===== __**Body plan**__**- James** __**Picture**__**- Both** __**Positive impact on humans**__**- Erika** Round worm parasites affect most plant and animal species that makes them known as important agricultural pests.This can either be good or bad. __**Negative impact on humans**__**- Erika** __**1 interesting fact**__**- James**