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图所示是子宫内胎儿、脐带和胎盘结构图，请填空： （1）图中[2]是指________。 （2）由胚胎的部分组织与子宫壁共同构成的结构[3]叫做_________。 （3）受精卵是在_________中形成的，通过___________进入子宫，胚胎发育的最终场所是_______。 （4）图中[1]是_________，当其发育成熟后就从母体排出，这个过程叫做_________，这种生殖方式叫做_________。 （5）胚胎是由__________不断地进行细胞分裂分化形成的，胚胎发育初期所需的营养物质来自______，胚胎在子宫内继续发育所需的营养物质通过_________从________获得。
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