若方程ax²+bx+c=0（a≠0）满足a+b+c=0，则方程必有一根为（　　）

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                                                                                                                                             木芙蓉
                                                                                                                                        南宋•吕本中
                                                                                                                    小池南畔木芙蓉，雨后霜前着意红。
                                                                                                                     犹胜无言旧桃李，一生开落任东风。

细胞通讯是细胞间交流信息，对环境做出综合反应的生理活动。下图甲示两种细胞通讯方式，乙为甲图中括号部位放大图，下列有关叙述中错误的是(　　)

甲                                         乙