What characteristics are shared between monotremes and placental mammals but not marsupials? What would this observation lead to conclude about the order in which these animals evolved?
Added by Joseph G.
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Step 1: Monotremes and placental mammals both have mammary glands, which are used to produce milk for their offspring. Show more…
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One of the most significant differences between the monotremes and marsupials is marsupials are ovoviviparous and monotremes are oviparous monotremes have a placenta and marsupials do not marsupials have mammary glands, whereas monotremes don't none of these monotremes have fur/hair and marsupials do not
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