IGCSE O Level Biology Certification Exam Tests
IGCSE O Level Biology Practice Test 42
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MCQ 206: Lives of organisms in ecosystem become threatened due to
MCQ 207: Blood in pulmonary arteries is at a lower pressure than blood in aorta allowing
MCQ 208: When the heart relaxes,
MCQ 209: Vertebral column faces the
MCQ 210: At intervals, along the length, the spinal cord
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