It took 1649 years for the world population to double going from 0.25 billion people to 0.50billion people how long did it take for time population to double once again to 1billion people

i took 200 years to reach the population of 1 billion from 0.50 billion.

from 1650-1850

Explanation:

Statisics on Human Population

Year A.D.Number of People (in billions)

1650             .50

1750             .70

1850               1.0

1925              2.0

1956             2.5

1966             3.3

1970              3.6

1974             3.9

1976             4.0

1980              4.4

1991                    5.5

2000              6.0

2004               6.4

please mark me as brainliest .. thanks

what's the rest of the question

answer; ///(b) it is composed of four protein chains and four heme groups;