Concept:Symbiosis is a close relationship between two different species. In mutualism, both species benefit from the interaction.Explanation:The egret and the buffalo share a mutualistic symbiotic relationship. While grazing, the buffalo stirs up insects and flies. The egret eats these insects, getting an easy meal. In return, the egret removes pests that bother the buffalo. This benefits both animals without harming either. The other options are incorrect: the egret does not sit for fun, for transportation, or to scare the buffalo.Answer:D. the egret and the buffalo have a symbiotic relationship.