Life on earth could never exist were it not for a series of very fortunate coincidences, some of which were unknown or poorly understood until the 20th century.
Vutomi a byi nga ta va kona emisaveni loko a ku nga ri hikwalaho ka swilo swo karhi leswi ku vuriwaka leswaku swi lo tiendlekela, leswi swin'wana swa swona a swi nga tiviwi kumbe a swi nga twisisiwi kahle kukondza ku va lembe-xidzana ra vu-20.