Parasites such as roundworms do play a role in the ecosystem, albeit a negative one. They can help control populations of their hosts, which can in turn impact the food chain and overall ecosystem balance. However, their presence can also have detrimental effects on the health and well-being of their hosts, and in some cases can lead to disease and even death. Overall, the impact of parasites on the ecosystem is complex and largely depends on the specific interactions between the parasite and its host species.
