Flexi Says: Throughout Earth's very long history, nearly all species that have lived have also gone extinct. Reasons for extinction typically involve changes to a species' environment that happened too quickly for the species to adapt, or that caused the species to become out-competed by another species. However, natural selection also occurs in response to environmental changes. As a result, new species evolve from older species. It is impossible to know exactly when the current human species, homo sapiens, will die out or whether new species will evolve from the existing species. Fossil evidence suggest that homo sapiens is only about 300,000 years old, which is very young for a species.
