Is ocean water homogenous or heterogenous?

Answer 1

It is homogeneous. Look up the two words in the dictionary and then decide if you agree.

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But if you think to many insoluble organic (including living organisms) or inorganic particles the ocean water can be considered as non homogeneous.

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With regard to the last sentence, the insoluble organic material that you are suggesting might cause one to consider it non-homogeneous.... the insoluble material is not ocean water. It's insoluble material. The ocean water and all of its dissolved minerals is rather homogeneous You could argue the point that the salinity varies greatly making it non-homogeneous if you take a look at the whole ocean. But a glass of ocean water is, in my opinion, homogeneous as I think it fits the definition well.