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OpenStudy (love.kat123):
What is the difference between monotremes and placentals? ain placentals the reproductive and excretory systems share a single opening c. placentals are the only mammals that lay eggs b. monotremes are the only mammals that lay eggs d. monotremes unborn young are nourished by the placenta
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OpenStudy (zairahernandez):
B. monotremes are the only mammals that lay eggs
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