Question

    The researchers examined 86 (1)/ mammal species and

    discover (2)/ that 50 per cent of species (3)/ altered their activity levels (4) no error (5) A sentence has been divided into four parts, one of which may contain an error. Identify that fragment and mark it as your answer. Mark (5) if the sentence contains no error. 
    A 4 Correct Answer Incorrect Answer
    B 1 Correct Answer Incorrect Answer
    C 3 Correct Answer Incorrect Answer
    D 2 Correct Answer Incorrect Answer
    E no error Correct Answer Incorrect Answer

    Solution

    The sentence starts with "The researchers examined," which is in the past tense. Therefore, the verb that follows should also be in the past tense: "discovered."

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