The relationship that will increase a population's size is when the birth rate is greater than the death rate. Thus, the correct option is D.
The population size may be defined as the presence of a number of individual organisms within a population irrespective of their gender.
When the Death rate > birthrate, the population size decreases.
When the Emigration rate > immigration rate, the population size decreases.
In population size, the number of males and females does not bother the reflection within the population.
When the birth rate is higher than the death rate, the number of people in the population drastically increases with respect to time.
Therefore, the relationship that will increase a population's size is when the birth rate is greater than the death rate. Thus, the correct option is D.
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