1) The Brexit process, initiated by the United Kingdom's referendum in 2016, led to the country's withdrawal from the European Union in 2020, marking a significant political and economic change for both the UK and the EU.

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

3) Insurance premiums are the payments made by policyholders to insurance companies in exchange for coverage.

4) The fall of the Berlin Wall in 1989 symbolized the end of the Cold War and the reunification of East and West Germany.