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Why are the platypus and echidna the only two egg-laying mammals?

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  • Why are the platypus and echidna the only two egg-laying mammals?


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The reason that odd, egg-laying mammals still exist ... Now only two kinds of monotremes are ... had suggested the platypus and the echidna diverged ...
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Positive: 53 %
... and placental mammals, egg laying was ... a platypus-like ancestor. The earliest echidna ... mammals arose, only a handful of monotreme ...
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Positive: 50 %

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Creationism and the Platypus by Jim Foley. ... Why is it only found in ... A.W., & Jenkins, F.A., Jr. (1987). The origin of egg-laying mammals. Nature, 326 ...
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Positive: 53 %
... which include only the platypus and ... But why would the platypus and echidna go the egg-laying route when every other mammal gives birth ...
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Positive: 48 %
Monotremes Egg-laying Mammals: ... There are only five living monotreme species: the duck-billed platypus and four species of echidna ...
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Positive: 34 %
Echidna ancestors swam with platypuses. ... or egg-laying mammals, ... sequences from the modern-day platypus and echidna to show the two species shared ...
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Positive: 11 %

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