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There are three conventional groups of mammals. The monotremes (including the platypus and echidna) are the oldest and the placentals (including humans) are the most recent to evolve. What third group evolved in between these two other groups?

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1. There are three conventional groups of mammals. The monotremes (including the platypus and echidna) are the oldest and the placentals (including humans) are the most recent to evolve. What third group evolved in between these two other groups?





 
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