As of 2013, the world’s total population was about

As of 2013, the world’s total population was about 7 billion people.

Explanation:

The world's human population is the total number of people living around the world at a specific time. It is determined by the births and deaths of individuals, as well as by their life expectancy.

The world population has gone from the almost 1 billion inhabitants in 1800 to over 6 billion in the year 2000. On October 30, 2011, it reached 7 billion. In November 2017, 7.35 billion inhabitants were counted.

Some projections estimate that the world's population could reach 11.4 billion in 2050 and 15.3 billion in 2100.

the correct answer is history and tradition.

c it says nothing about connecting those 2 seas.