Final answer:
Commensalism is a symbiotic relationship in which one species benefits while the other species is unaffected, mutualism is a symbiotic relationship in which both species benefit, and parasitism is a symbiotic relationship in which one species benefits while the other species is harmed.
Step-by-step explanation:
Commensalism is a symbiotic relationship in which one species benefits while the other species is unaffected. An example of commensalism is the relationship between cattle egrets and grazing mammals, where the egrets benefit by feeding on insects that are stirred up by the mammals, while the mammals are not affected.
Mutualism is a symbiotic relationship in which both species benefit. An example is the relationship between bees and flowers, where bees benefit from nectar and flowers benefit from pollination.
Parasitism is a symbiotic relationship in which one species, called the parasite, benefits while the other species, called the host, is harmed. An example is the relationship between ticks and dogs, where ticks feed on the dog's blood and harm the dog.