| Answer | Crossword Clue |
|---|---|
| heteroecism | a form of parasitism that requires two (usu unrelated) host species to complete its life-cycle |
| heteroecisms | HETEROECISM, a form of parasitism that requires two (usu unrelated) host species to complete its life-cycle |
| schistosome | A parasitic flatworm that needs two hosts to complete its life cycle. The immature form infests freshwater snails, and the adult lives in the blood vessels of birds and mammals, causing bilharzia in humans |
| schistosomes | A parasitic flatworm that needs two hosts to complete its life cycle. The immature form infests freshwater snails, and the adult lives in the blood vessels of birds and mammals, causing bilharzia in humans |
