If you look up oceans and seas, you’ll form your own opinion; but for now, there are five oceans (which are really one big expanse of salt water covering 70% of the world’s surface) and several seas (some of which are part of a named ocean and others are fully enclosed). By that reckoning, only sentence 2 can be correct. Q2 would be a no.
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seagullcan the plural noun "oceans" cover such waters as the Mediterranean Sea and the Red Sea?No. Oceans are much larger.