AP BIOLOGY

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ECOLOGY

HUMANS AND THE BIOSPHERE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
All other things being equal, the size of the population will decrease if ____
A
birthrate exceeds the death rate
B
immigration rate exceeds emigration rate
C
death rate exceeds birthrate
Explanation: 

Detailed explanation-1: -Natural decrease occurs when death rate is greater than birth rate. This means that more deaths occur in a population than babies are born so population numbers decline.

Detailed explanation-2: -If the birth rate stays the same and the death rate decreases, then population numbers will grow. If the birth rate increases and the death rate stays the same, then population will also grow.

Detailed explanation-3: -Population can grow when its birthrate is greater than its death rate. If birthrate=death rate, population stays the same. If death rate is > birthrate, population shrinks. Immigration causes population to grow, while emigration causes population to decrease.

Detailed explanation-4: -If birth and death rates are equal, a zero population growth would result.

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