Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

[EX Q]: Fish reached substantial diversity during this time , leading the Devonian to often be dubbed the `` Age of Fish '' . The first ray - finned and lobe - finned bony fish appeared , while the placoderms began dominating almost every known aquatic environment . The ancestors of all four - limbed vertebrates ( tetrapods ) began adapting to walking on land , as their strong pectoral and pelvic fins gradually evolved into legs . In the oceans , primitive sharks became more numerous than in the Silurian and Late Ordovician .
[EX A]: Devonian

[EX Q]: The Suez Crisis or the Second Arab -- Israeli War also named the Tripartite Aggression ( in the Arab world ) and Operation Kadesh or Sinai War ( in Israel ) , was an invasion of Egypt in late 1956 by Israel , followed by the United Kingdom and France . The aims were to regain Western control of the Suez Canal and to remove Egyptian President Gamal Abdel Nasser , who had just nationalized the canal . After the fighting had started , political pressure from the United States , the Soviet Union , and the United Nations led to a withdrawal by the three invaders . The episode humiliated Great Britain and France and strengthened Nasser .
[EX A]: Suez Crisis

[EX Q]: The Iguazu Falls , Iguazú Falls , Iguassu Falls , or Iguaçu Falls ( Spanish : Cataratas del Iguazú ( kataˈɾatas ðel iɣwaˈsu ) ; Guarani : Chororo Yguasu ( ɕoɾoɾo ɨɣwasu ) ; Portuguese : Cataratas do Iguaçu ( kataˈɾatɐs du iɡwaˈsu ) ) are waterfalls of the Iguazu River on the border of the Argentine province of Misiones and the Brazilian state of Paraná . They are the largest waterfalls system in the world . The falls divide the river into the upper and lower Iguazu . The Iguazu River rises near the city of Curitiba . For most of its course , the river flows through Brazil ; however , most of the falls are on the Argentine side . Below its confluence with the San Antonio River , the Iguazu River forms the boundary between Argentina and Brazil .
[EX A]:
Iguazu Falls