population 2

An animal population decreases from 800 individuals to 600 individuals. Which of the following could explain this change in population size? 

•  The population size of the animal’s predator increased. 
•  The emigration rate of the animals from the population decreased. 
• The number of breeding pairs in the animal’s population increased. 
• The number of species competing with the animal for food decreased.  

 On remote islands, immigration and emigration usually do not have a large effect on population sizes. A bird population on a remote island remains at a relatively constant size year after year. Which of the following most likely describes the birthrate and the death rate for this population? 

•  Birthrate and death rate are both zero 
•  Birthrate and death rate are close to equal. 
• Birthrate is significantly less than death rate. 
• Birthrate is significantly greater than death rate. 

The number of deaths compared to the total number of people in a population

• death rate
• doubling time
• population decline
• birth rate

The number of years it takes a population to double in size based on its current growth rate

• death rate
• mortality rate
• birth rate
• doubling time

The number of births compared to the total number of people in a population

• death rate
• birth rate
• baby boom
• doubling time

Which is NOT a reason for the decreasing death rate?

• Better health care
• Greater food supply
• Cleaner water
• More pollution

Which of the following is NOT a challenge to a growing population?

• Overcrowding
• Housing shortages
• Overuse of resources
• Increased food supplies

The average number of people per square mile

• population distribution
• population density
• urbanization
• population rate

Densely populated areas such as cities

• Urban areas
• Rural areas
• Countryside
• Suburbs

Sparsely populated areas such as the country side

• Urban areas
• Rural areas
• Suburbs
• Urbanization