Better nutrition, fewer infant deaths, increased average life span and improvement in medical technology has help in the rapid growth of the world population
What impact can the contemporary terrorism and modern wars which usually employ weapons of mass destruction have on population dynamics?
Ok tema desarrollado
hay dos variables que definen el aumento de población los cuales son, nacimiento y muertes, si hay mas humanos que nacen esta aumente pero por otro lado si es más la que muere que la que nace esta disminuye. hay varios factores que influyen como la riqueza, disponibilidad de anticonceptivos, creencias y el costo de la crianza de los niños.
Demographics have to do with the pattern of species in a particular environment.
The study of humans looking at their age, time not forgetting structures.
Population dynamics is the study that has to do with humans on the environment at particular time looking at their age not forgetting behavior.
What is human principles?
How do we know if a species is heading towards extinction?
Human demography (population change) is usually described in terms of the births and deaths per 1000 people. When births of an area exceed deaths, population increases. When the births of an area are fewer than deaths, the population decreases. The annual rate at which the size of a population changes is:
Natural Population Change Rate (%) = [(Births – Deaths)/1000] X 100
During the year 2000, the birth rate for the world was 22 and the death rate was 9. Thus, the world's population grew at a rate of 1.3%. The annual rate of population change for a particular city or region is also affected by immigration (movement of people into a region) and emigration (movement out of a region). Population change rate is:
Population Change Rate = (Birth Rate + Immigration Rate) – (Death Rate + Emigration Rate)
Highly industrialized nations, like the United States, Canada, Japan and Germany, generally have low birth and death rates. Annual rates of natural population change vary from -0.1% to 0.5%. In some industrial nations (e.g. Germany and Russia) death rates exceed birth rates so the net population decreases over time.
Newly industrialized countries (e.g. South Korea, Mexico and China) have moderate birth rates and low death rates. The low death rates result from better sanitation, better health care and stable food production that accompany industrialization. The annual rates of natural population change are about 1 percent to 2 percent in these countries.
Countries with limited industrial development (e.g. Pakistan and Ethiopia) tend to have high birth rates and moderate to low death rates. These nations are growing rapidly with annual rates of natural population change exceeding 2 percent.
Several factors influence human fertility. Important factors influencing birth and fertility rates in human populations are:
• average marriage age,
• availability of birth control,
• family labor needs,
• cultural beliefs,
• religious beliefs and
• the cost of raising and educating children.
The rapid growth of the world's population over the past 100 years is mainly results from a decline in death rates. Reasons for the drop in death rates include: better nutrition, fewer infant deaths, increased average life span and improvements in medical technology.
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