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Answer:
The two factors that decrease the size of a population are mortality, which is the number of individual deaths in a population over a period of time, and emigration, which is the migration of an individual from a place
Step-by-step explanation:
A lack of food, warmth, water, and rest.
According to Maslow's Hierachy of Needs, you need these 4 things to survive. So, a lack of any of these materials will lead to a downfall in population.