Population density defines number of individuals present in a particular area. Factors that affect the growth of a population, regardless the population size, are known as density-independent limiting factors as these factors limit the population growth, regardless the density of a population. These factors include climatic conditions, natural disasters, human activities, and sunlight.
Thus, the correct answer is 'option). density-independent limiting factors.'
Helium does not react with any other substances, thus the substance’s internal structure is never greatly affected and thus helium cannot have any chemical properties.
