Seashells whispered secrets of the ocean's past.
Meaning: This sentence describes the seashells as if they were whispering stories and secrets about the history of the ocean.
Choice of Words: Seashells are the hard outer coverings of marine animals. Whispered means to speak softly or in a low voice. Secrets are pieces of information that are kept hidden. Ocean's indicates something related to the ocean. Past refers to the time that has already happened.
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