What is the difference between monotremes and placentals? a. in 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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The difference between monotremes and placentals is monotremes are the only mammals that lay eggs.

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Asked 5/13/2014 7:27:02 AM

Updated 2/11/2016 11:40:40 AM

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Updated 2/11/2016 11:40:10 AM

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Janet17

"ears develop" -is a change that occurs during amphibian metamorphosis.

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Updated 2/11/2016 11:43:30 AM

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All of the above. Spreading wing, flattening feathers, and "panting" all allow a bird to maintain a constant body temperature in extremely hot weather.

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