Question

QUESTION 3

1. How many years did it take for the world's population to go from one billion to two billion?

   		60 years
   		30 years
   		130 years
   		16 years

6 points   

QUESTION 4

1. Human population growth ____________.

   		is about the same worldwide
   		tends to exhibit a J-shaped curve (exponential growth) in economically underdeveloped countries
   		is increasing rapidly in Europe
   		is declining overall

6 points   

QUESTION 5

1. Which of the following scenarios would exemplify a density-independent population regulation factor?

   		Rainbow smelt introduced into Lake Winnipeg competing with the native emerald shiners for food
   		Boll weevils destroying a cotton crop
   		A stomach flu outbreak in New York City
   		A drought in West Texas that dries up ponds, lakes, and streams

Answer 1

The answer to the first question is 130 years, for the world's population to rise upto 2 billion population from 1 billion population but to reach 3 billion it just took around 35 years.

Option A is the answer that is J shaped curve which is exponential growth. Other two options are incorrect as the there is not s rapid growth of population in Europe nor there is decrease in population overall. But it's not the case always as the exponential growth stops as the resources in the region start to deplete.

The answer to the third question will be drought in west Texas as such factors are density independent factors. These factors include disasters, temperature, oxygen levels.

Hope this helps, Good luck!!