The most likely truth about the organism based on this information is 'it is a protist because it is found in salt water'.
A protist is an organism from the kingdom Protista, which is generally found in marine (salt) water conditions.
Protists are eukaryotic (thereby they have cell nuclei) and they can be multicellular or unicellular.
In conclusion, the most likely truth about the organism based on this information is 'it is a protist because it is found in salt water'.
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