What came first, the chicken or the egg?

 Sir Albert Attenborough Saurus and Ralf From the Fountain Docus explain us the most importants facts in history:

https://lariojaedues-my.sharepoint.com/:w:/r/personal/rfernandezg09_larioja_edu_es/Documents/Thinking%20routines.docx?d=w9e82b2e5069349b197e99672b5dca822&csf=1&web=1&e=nFqW87