Among the given options, immigration is considered as the limiting factor to a population. Thus, the correct option is D.
What is Population?
A Population may be defined as the number of individuals of the same species living in a particular area at a definite time. It also represents the number of males and females in any population with respect to their characteristics.
Competition, predation, and human disturbances are responsible for the reduction of any population. This is because these factors generally involve the ultimate death of individual and health damage.
While immigration is typically a process through which an individual has come in order to live in that place. This place is not native to the individual. This increases the population of any specific region.
Therefore, among the given options, immigration is considered as the limiting factor to a population. Thus, the correct option is D.
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