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    2.

    Which of the following is not a valid reason why the morphological species concept can be problematic?

    A

    It can be difficult to distinguish between intraspecific variation and interspecific differences.

    B

    Cryptic species may be morphologically identical but reproductively isolated.

    C

    It requires detailed genetic analysis.

    D

    Morphological traits can be influenced by environmental factors leading to phenotypic plasticity.

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    7.

    The biological definition of a species depends on

    A

    The geographical distribution of two groups of organism

    B

    Reproductive isolation of two groups of organism

    C

    Anatomical and development differences between the two groups of organism

    D

    Difference in the adaptation of two groups of organism

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