1 . According to the "wear -and- tear theory", ageing takes place due to ____ .

  • A. biological and social consequences
  • B. psychological and biological consequences
  • C. psychological and social consequences
  • D. biological , mental and social consequences
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ক ইউনিট ২০১৭-২০১৮ || ঢাকা বিশ্ববিদ্যালয় || 2017
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