The possible disadvantages of an imperfectly closable shell seem to be compensated for by increased mobility. [Please select]
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DEFENSE Box turtles rely for protection on the closable shell and on inconspicuousness; defense reactions, except in the rare instances that biting is provoked, are purely passive. [Please select]
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The closable shell of box turtles is of obvious survival value in providing protection for the soft parts of the body. [Please select]
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