The term 'became extinct' can be summarized by three crossword solutions: perished (8 letters), died (4 letters), and died out (7 letters). This term refers to a species or population of organisms that has completely disappeared from the face of the Earth, either through natural causes or due to human activity. It is a phenomenon that has been occurring since the dawn of time, but has become increasingly more common in recent years due to human-induced climate change and destruction of habitats.