O Level Biology e-Book's MCQs - Complete
Mode of action of heart Quiz App & e-Book Download - 1425
Apps:
MCQ:
The "dub" sound is produced when
- atria are fully contracted
- atria start to relax
- after the semilunar valves are closed
- after the bicuspid and tricuspid valves suddenly close
c
O Level Biology App & e-Book Tests PDF Download
Basal Metabolism Test 1436
Spinal Cord and Nerves Test 1437
Leaf Adaptations for Photosynthesis Test 1438
Spinal Cord and Nerves Test 1439
Food Chain and Web Test 1440
Bile and Origination and Functions Test 1441
Internal Skeleton Test 1442
Dormancy and Seed Germination Test 1443
Introduction to Biotechnology Test 1444
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O Level Biology MCQs eBook Download
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