读甲乙两国轮廓图(下图),完成下列要求。

(1)简要回答图示甲、乙两国在自然资源方面各具有的突出优势。
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(2)简述甲、乙两国人口分布的特点?
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(3)①、②两处,海水盐度的季节变化较大的是哪一处?为什么?
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