1) The Russian Revolution in 1917 resulted in the overthrow of the monarchy and the establishment of a communist government under Vladimir Lenin.

2) Male seahorses are the ones who give birth to their offspring.

3) The Alps, located in Europe, are a popular destination for skiing, mountaineering, and hiking.

4) Banks play a vital role in the economy by facilitating the flow of funds between savers and borrowers, providing loans, and offering various financial services.