读诗词，回答问题。      

                                                     采桑子                         

                                                     欧阳修

                                             春深雨过西湖好，

                                             百卉争妍，

                                             蝶乱蜂喧，

                                             晴日催花暖欲然。 

                                             兰桡画舸悠悠去。

                                             疑是神仙，

                                             返照波间，

                                             水阔风高飏管弦。    

欧阳修的这首词描写的是一幅迷人的春天景象：阳光、雨水、鲜花、蝴蝶、蜜蜂。请回答

(1)影响植物开花的非生物因素有哪些？

(2)蜜蜂、蝴蝶和鲜花之间有什么样的关系？