Read the graph and answer the following questions.

(1) the natural rate of population growth is equal to the birth rate minus the death rate, calculated by reading the figure Niger is 3.43, the highest among the countries listed; the high natural rate of population growth leads to the problem of rapid population growth; rapid population growth caused by the number of people, will increase the pressure on the economy, employment, resources and the environment, etc., and consumption will lead to accumulation of less, affecting the development of the economy, the people's living standard improvement (1) The measures taken are to implement family planning and control population growth. (2) The chart shows that developed countries with high economic levels, slow population growth; developing countries and regions with low levels of economic development, population growth, also shows that the more economically developed, the higher the level of productivity, which has a decisive impact on population growth, because on the one hand, it affects the key to people's fertility, and at the same time, it also affects the standard of living and health care level high.

(3) read the figure can be seen in Germany, the mortality rate is higher than the birth rate, the birth rate depends on the concept of people's fertility, and the mortality rate depends on the proportion of elderly people, Germany's high level of economic development, high standards of living and health care, people's average life expectancy is extended, the elderly accounted for a high proportion of high, so the mortality rate is high.

Therefore, the answer is: (1) Niger; high birth rate, rapid population growth. Impact: increased pressure on the economy, employment, resources and the environment, resulting in reduced accumulation, slow economic development, people's living standards rise slowly, but also not conducive to improving the quality of the population． Measures: the implementation of family planning.

(2) The level of economic development, especially the level of productivity, plays a decisive role in population growth. Developed countries or regions with high levels of economic development, population growth is slow; while developing countries and regions with low levels of productivity, the number of labor force demand, resulting in a high birth rate.

(3) Germany; economically developed, high standards of living and health care, people's average life expectancy is extended, the proportion of elderly population is high, so the population mortality rate is high.