1. There are three main types of symbiotic relationships: parasitism, commensalism, and mutualism. 共生关系主要有三种类型：寄生关系、共生关系和互惠关系。
2. These are not single individual plants; each one is a symbiotic combination of an alga and a fungus. 这些不是单个的植物；每一种都是藻类和真菌的共生组合。
3. A symbiotic relationship is an interaction between two or more species in which one species lives in or on another species. 共生关系是两个或多个物种之间的相互作用，其中一个物种生活在另一个物种体内，或依靠这一物种生活。
4. Parasitism is a kind of predator-prey relationship in which one organism, the parasite, derives its food at the expense of its symbiotic associate, the host. 寄生是一种捕食者与被捕食者之间的关系，寄生者利用共生伙伴——宿主来获取食物。
5. The complex interplay of species in symbiotic relationships highlights an important point about communities: Their structure depends on a web of diverse connections among organisms. 物种在共生关系中复杂的相互作用突出了群落的一个重要特点：它们的结构取决于生物之间多样的联系网络。
