Question

{"given":"Four organisms are listed: tapeworm, mosquito, leech, and sea anemone. We need to identify which one is not a parasite. Parasitism is a symbiotic relationship where one organism (parasite) benefits at the expense of another organism (host).","key_observation":"The key is to understand different types of ecological relationships and feeding strategies. True parasites live on or in their host for extended periods and derive nutrition while harming the host. Sea anemones are cnidarians that are free-living organisms, often forming mutualistic relationships rather than parasitic ones.","option_analysis":[{"label":"(A)","text":"tapeworm","verdict":"incorrect","explanation":"Tapeworms are obligate endoparasites that live in the intestines of vertebrate hosts, absorbing nutrients and causing harm to the host organism."},{"label":"(B)","text":"mosquito","verdict":"incorrect","explanation":"Mosquitoes are temporary ectoparasites. Adult females feed on blood from hosts for reproduction, making them parasitic in their feeding behavior, even if not permanent residents."},{"label":"(C)","text":"leech","verdict":"incorrect","explanation":"Leeches are ectoparasites that attach to hosts and feed on their blood, deriving nutrition at the host's expense during the feeding period."},{"label":"(D)","text":"sea anemone","verdict":"correct","explanation":"Sea anemones are free-living cnidarians found in marine environments. They capture prey using their tentacles and may form mutualistic relationships (like with hermit crabs) but are not parasitic organisms."}],"answer":"(D)","formula_steps":[]}