Which mammal group gives birth to live young with a placenta?

Placental mammals.

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  1. Placental mammals ✔
  2. Marsupials
  3. Monotremes

Why: Placental mammals are the most species-rich group and use a placenta during gestation.

Huh, didn't know that: Placental mammals are the most species-rich group and use a placenta during gestation.

The dad joke
Placentals are attached to the idea of family.
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References

Answer: Placental mammals. Placental mammals are the most species-rich group and use a placenta during gestation.

  1. Mammal en.wikipedia.org/wiki/Mammal
    the most species-rich group is the viviparous placental mammals
    Checked 2026-11-07.

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