What was unique about the building of the Panama Canal? A. It is one long canal channel through the jungle b. It used a series of locks and lakes to cross the area c. It had a set of four lakes to travel through d. It was completed in a record time of 3 years

b it used a series of locks and lakes to cross the area.

Explanation:

The Panama Canal is an artificial waterway that uses canal locks on each side to lift ships up to an artificial lake 85 feet above sea level and then lower the ships on the other side.  

So it is not just one long canal channel, it doesn´t have a set of four lakes (only one) and it took the US a little longer than three years to complete the project that France had started, namely 10 years.

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the crusades are one of the most significant events in the history of europe and the middle east.   they were a series of religious wars carried out by christian crusaders from europe during the timeframe of the middle ages.   beginning in 1095 ce, the crusades saw european knights and noblemen travel to the middle east in an attempt to capture the holy land away from muslim people that had controlled the region for the previous centuries.   the term crusade means ‘cross’.   therefore, the europeans that became crusaders viewed themselves as ‘taking up the cross’.   in fact, many of the crusaders wore crosses on their clothing and armor as they made their pilgrimage to the holy land.

explanation: