相同点：
1.无脊椎动物
2.原始消化腔
3.大都雌雄同体,既可以有性生殖,也可无性生殖.
一楼说都是双胚层是错的,扁形动物有中胚层.
不同点：
1.腔肠动物是辐射对称,扁形动物是两侧对称
2.腔肠动物只有中胶层,扁形动物有中胚层
3.扁形动物由原肾管排泄
4.扁形动物有脑神经节,腔肠动物只有神经网.
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