Biology (High School) quiz

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Ichthyosaurs were aquatic dinosaurs. Fossils show us that they had dorsal fins and tails, as do fish, even though their closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. The dorsal fins and tails of ichthyosaurs and fish are
Which of the following statements is NOT correct about ancient Earth?
Which of the following statements is not correct about lipids?

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