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“胎生”红树
在我国东南沿海,生长着大片海滩红树林,红树是植物中少有的“胎生”植物,种子萌发于树上,生长成20至40厘米的小树后,才从大树上落下,直插淤泥生根。如果不是这样,种子就会被海浪冲走,这就是自然界的适者生存定律。