Why did japan and china got such a high population.

China has the largest population in the world, with a shocking number of 1.3 billion people and growing by the minute. ... Overpopulation in a country is the result of the number of people in an area being much higher than the country's available resources.

And for Japan, the Japanese population grew steadily throughout the 20th century, from around 44 million in 1900 to 128 million in 2000. The gains were primarily due to increased life expectancy, but also buoyed by families that typically had at least two children. ... By median age, Japan is the oldest large country in the world.

But that my opinion though.

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explanation:

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the topic i chose to write about was " why scuba diving is so popular". the topic is suitable for the audience because it is the easiest to develop and explain, it can be explained in a simpler more conversational manner, it does not require the use of too many technical words, and the final reason for selecting this topic is that it is the one most people can relate to, you might not know too much about scuba diving, but you could probably agree that it is very popular. the purpose of the writing about this topic is to convince more people about the benefits both for the body and the mind that   scuba diving can have on a person. it can you keep fit since it requires a lot of energy when swimming underwater; it also you relax because you forget about the world when you are underwater being mesmerized by the underwater world. i would write this paper in the summer, a perfect time to give scuba diving a try if a person has not done it yet.