Resurrection involves taking DNA from extinct species, multiplying the cells, and implanting them into a similar host species' womb to potentially bring back extinct animals. The document discusses how woolly mammoths, saber-toothed cats, giant sloths, and dodos went extinct but may be possible to resurrect due to preserved DNA samples. While some think resurrection could fix past extinctions, others are concerned it could harm existing ecosystems. The document provides details on each potential species and why their DNA may enable resurrection.