Population-level is affected by many consequences like competition for food, resources, residential areas, etc. As the parents are surviving it results in the not leveling off of the population during the year of zero population growth.
Population growth is the increasing number of the population. The major social factors responsible for population growth are
When the population growth is not recorded then too the population does not level off as the parents are still present.
Thus, this is the main reason for not leveling off of the population.
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