A - viii The age of a find is established
B - iii Evidence suggesting a high level of skill
C - vi A lack of evidence to show the precise way in which the find was used
D - iv A possible explanation why similar finds haven't been made elsewhere
E - i A long-standing mystery is now partially explained

A - The paragraph discusses the age of the find, particularly the fish hooks made from seashells, which are dated back up to 23,000 years. This establishes the age of the discovery, highlighting its significance in terms of human history and technology.

B - The paragraph provides evidence that suggests a high level of skill among early modern humans in Southeast Asia. It discusses the sophistication of their fishing technology and watercraft, indicating advanced maritime skills. This evidence confirms the theory that early humans in this region had advanced capabilities for fishing.

C - This paragraph highlights the uncertainty surrounding the exact methods used by the ancient inhabitants of Jerimalai to catch deep-sea fish. Despite the discovery of fish hooks made from seashells, researchers are unsure about the precise fishing techniques employed by these early humans. This lack of evidence regarding the specific methods used to catch deep-sea fish leaves room for speculation and further investigation into the fishing practices of ancient Southeast Asian cultures.

D - The paragraph discusses a possible explanation for why similar finds haven't been made elsewhere, particularly in Africa. It suggests that the absence of evidence for early maritime technology in Africa may be due to factors such as sea level rise over time. The Jerimalai site, which provides insight into early modern human capabilities, is highlighted as a unique example of preservation due to its location.

E - This paragraph discusses the significance of the discovery of ancient fish hooks in shedding light on the mystery of human migration to Australia. It explains that the fishing skills of early modern humans may have facilitated their migration to Australia by enabling them to exploit coastlines and survive at sea. The discovery of fish hooks in the Jerimalai cave contributes to solving the puzzle of how and when Australia was first colonized, providing partial explanations for this long-standing mystery.