Respuesta :

donaldtrump1960

Answer:

I'm presuming you mean the three different subcatagories or taxa as there around 25/26 mammalian orders. The three taxa are - Prototheria or Monotreme = Mammals that lay eggs Metatheria Marsupial = Mammals with external development pouches.

Explanation:

jb417902

Answer:

Monotremes are mammals that lay eggs.

A placental mammal develops inside its mother's body until its body systems

can function on their own.

Explanation:

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