6. Bdelloid Rotifers
Bdelloid rotifers are microscopic freshwater invertebrates that have survived without sexual reproduction for approximately 80 million years. (nationalgeographic.com) They achieve this by entering a state of anhydrobiosis, effectively suspending all metabolic processes during adverse conditions. (nationalgeographic.com) This remarkable ability allows them to withstand extreme environments, including desiccation and radiation, and evade aging through cryptobiosis. (pubmed.ncbi.nlm.nih.gov) Their unique survival strategies have attracted significant scientific interest, offering insights into resilience and longevity. (pubmed.ncbi.nlm.nih.gov)