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Marsupials seem to have done ok in regards to survival and the ability to thrive. And they have been practicing abortion since their evolution. The kangaroos, koalas, tasmanian devils, wombats and Opossum are all able to terminate their post gestation embryos. They do this when they are under pressure. Usually injury to the mother or a general lack of adequate food marsupial females have the ability to stop feeding which starves the embryo.
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