SORU: cümlede boş bırakılan yerlere uygun düşen sözcük ya da ifadeyi bulunuz
In 1517, the Italian physician Girolamo Fracastoro was probably the first person ---- that fossils are animal remains; however, it was not until the 18th century that scientists ---- to realise that fossils can tell us a great deal about the history of living things.