What is this phenomenon called

Reference no: EM13142696

Scientists have found that early fish have lungs and then developed swim bladders. Today humans have lungs and not swim bladders. What is this phenomenon called?

Reference no: EM13142696

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What is this phenomenon called : Scientists have found that early fish have lungs and then developed swim bladders. Today humans have lungs and not swim bladders. What is this phenomenon called?

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