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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.
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B. a substance that can donate an H+ ion
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i imagine them as peopel in a big city, or animals in the wild with predators that are hungry, the cell uses the ribosomes for food and to heal the cell with energy.
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Coal and oil (if there are two answers)
