MCAT Question of the Day
    •

    Q:

    		 Male turkeys possess wattles which are large, fleshy tissue around the neck and head area. Large wattles serve as a sign of high testosterone and often indicative of reproductive ability. Wattles are an example of
    		 

    A

    		 primary sex characteristics

    B

    		 secondary sex characteristics

    C

    		 vestigial structures

    D

    		 constitutive structures



    Evolution |
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