O Level Biology Study App | GCSE Biology MCQ e-Book PDF
O Level Biology MCQs (O Level) From Textbook

O Level Biology MCQs – Certification Test 439

GCSE Biology MCQ (Question 439) – Study App & e-Book Download

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MCQ 439: All are wrong for white blood cells (leukocytes) but:

  1. lack nucleus
  2. transport oxygen
  3. lack hemoglobin
  4. produce antibodies

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