___________________ refers to a rapid increase in the size of a population caused by such factors as a sudden decline in infant mortality or an increase in life expectancy. It particularly means the very great and continuing increase in human population in modern times. Optimal population size appears adequate for economy, education, healthcare, and environment.
举一反三
- Population policies have significant legal, social, ethical, and cultural impact. Optimal population size appears adequate for economy, education, healthcare, and environment. Family planning is important for adjusting the size of population.
- There is a rapid increase in population in that country that has caused a food (short) ________.
- 2) Why will food production have to increase 70 percent by 2050? Because the population will increase to _______ by 2050.
- The main factors contributing to the dramatic increase in the human population in the 20th century are A: industrial revolution and modern medicine. B: increased education and new pesticides. C: increased immigration and decreased warfare. D: new agriculture methods and new food crops. E: decreased warfare and increased birth control.
- A marketing group is studying population trends. It predicts that the population P of a certain city will increase at the rate of dP/dt people per year, where dP/dt=15000/sqrt____ and t is the number of years past 1980. What is the expected increase in population from 1980 to 2001?