First slide

Populations

Question

Under normal conditions, the most important factors influencing population density are

Easy

A

Immigration and natality
B

Natality and mortality
C

Mortality and immigration
D

Emigration and immigration

Solution

Under normal conditions, natality (birth rate) and mortality (death rate) are the most important factors influencing population density, the other two factors assuming importance only under special conditions. For instance, if a new habitat is just being colonised, immigration may contribute more significantly to population growth than birth rates.

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