In this task, you're given an ambiguous question (which can be answered in more than one way). Your task is to write a question that clarifies the given question in such a way that the generated question has one unique answer.

Who were the first european to reach the americas and when did they arrive?
Who were the first Europeans to reach the Americas?

How many days does it take an embryo to implant?
How many days does it most likely take for a human embryo to implant?

What is the primary type of mining that takes place under the bolivian mountain?

What is the primary type of mining that takes place under the bolivian mountain initially by the Spanish Empire?