I think of my backyard. There's tons and tons of flowers back there that attracts many bees during the spring and summer. The bee and the flower have a mutualistic relationship, and here's how: the bee goes from flower to flower, getting pollen, which benefits them. Some of this pollen gets on their bodies, and when they go to another flower, said pollen can rub off on other flowers, giving those flowers pollen. I hope this makes sense!