Over population and Under population

Q. Which of these regions have the highest population density in the world?

1. South-Central Asia
2. Eastern Europe
3. South America
4. Oceania

Q. Which of the following is NOT a reason for overpopulation?

1. Better medical facilities causing decrease in death rates
2. High migration due to better opportunities
3. Rise in birth rates
4. Increase in death rates

Q. Why Orchids are found in the tropical areas.

Q. Which of the following is not a reason for overpopulation?

1. Better medical facilities causing decrease in death rates
2. High migration due to better opportunities
3. Increase in death rates
4. Rise in birth rates