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You are sharing some bizarre trivia from your biology class with a friend. Select ALL the sentences that correctly report Professor Higgins's strange biological fact.
Original quote: "Octopuses have three hearts."
The correct answers are Professor Higgins said that octopuses have three hearts and Professor Higgins said that octopuses had three hearts.
When reporting a general truth or a scientific fact, "backshifting" (changing the present tense to the past tense) is optional.
You can keep the present tense ("have") because the fact is still true today. However, standard sequence-of-tenses rules also allow you to backshift to the past tense ("had") to match the past reporting verb ("said").
"Had had" is incorrect because past perfect implies they no longer have three hearts. "Says... had" is incorrect because a present-tense reporting verb ("says") cannot be followed by a backshifted past tense if the original statement was in the present.