In which years human population reached 1 billion, 2 billion and 6 billion?

which type of age pyramids of human population as shown by the 1, 2, and 3 respectively in the following figures?

Study the 3 representative figure of age pyramid relating to human population given below and answer the following question: Which one of them is ideal for a population and why?

Study the 3 representative figures of age pyramid relating to human population given below and answer the following question: How do such age-profile studies help policy makers get concerned about our growing population and prepare for future planning (say for example :for the year 2022).

Study the three representatives figures of age pyramid relating two human population given below and answer the following questions. Which one of them is ideal for population and why?

The most important factor which determined the increase in human population in india during the 20th century was

In the picture provided, what is the relationship between (1) and (2) with respect to population interaction and beween (3) and (4) with respect to trophic levels.

The population p(t) at time t of a certain mouse species satisfies the differential equation d (p(t))/(dt)=0. 5 p(t)-450 If p(0)""=""850 , then the time at which the population becomes zero is (1) 2 ln 18 (2) ln 9 (3) 1/2 In 18 (4) ln 18

Mention any two probaable reasons for rapid rise of population in our country from about 350 million at the time fo independence to about 1 billion by the year 2000.

fill in the blanks presently human population needs ....... years to double.