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Suggest a hypothesis why endotherms have independently evolved a 4-chambered heart if mixing of blood seems not to be a major issue. what else makes a 4-chambered heart preferable for sustaining the high
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Suggest a hypothesis why endotherms have independently evolved a 4-chambered heart if mixing of blood seems not to be a major issue. what else makes a 4-chambered heart preferable for sustaining the high metabolic oxygen demand of tissues in endotherms?

User Carlos AG
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The 4 chambered heart is cheaper to maintain and manufacture.
User Sheela
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