how insect no lays egg and not a mammal
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mammals because, like reptiles and birds, they lay eggs rather than having live birth. In a number of other respects, monotremes are rather derived, having highly modified snouts or beaks, and modern adult monotremes have no teeth.
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Tsetse flies do not lay eggs like most others, instead giving birth to a single live larva, which immediately burrows underground to avoid predation.It can be presumed by the fact that no other mammals anywhere else in the world lay eggs, that evolution saw this trait as being inferior to live or placental birth (marsupials) and that all of the other mammals who did possess this trait became extinct due to natural selection.
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