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A circulatory system with blood vessels and at least one heart is required by all animals with
1. aerobic cellular respiration.
2. internal digestion.
3. sedentary lifestyles.
4. many layers of cells.
1. aerobic cellular respiration.
2. internal digestion.
3. sedentary lifestyles.
4. many layers of cells.
Subtopic: Â Circulatory Pathways |
Level 4: Below 35%
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How many of the given statements are correct:
| I: | Fishes have a 2-chambered heart with an atrium and a ventricle. |
| II: | Amphibians and the reptiles (except crocodiles) have a 3-chambered heart with two atria and a single ventricle. |
| III: | Crocodiles, birds and mammals possess a 4-chambered heart with two atria and two ventricles. |
| IV: | The only vertebrates where the heart pumps out deoxygenated blood are fishes. |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Â Circulatory Pathways |
Level 3: 35%-60%
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