What factors can cause the size of a population of living things to change?  

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gsenviro | College Teacher | (Level 1) Educator Emeritus

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The population of living things in an area can be impacted by a number of factors. These variables include availability of food and nutrients, favorable environmental conditions, presence of predators, etc. In general, a population would grow if there is sufficient food and nutrients available in the region. For example, deer population would grow comfortably in grasslands as compared to desert or tundra.If for some reason, say human intervention (in terms of over-grazing by cattle or deforestation), the favorite food supply is impacted, population of the living beings would also be impacted. Presence of more predators will also adversely impact the population. If the population of predators increases or new predators are introduced, the population of the prey would fall. Similarly, adverse environmental factors (including temperature, climate, water availability, etc.) will also negatively impact the population of living beings. Hope this helps. 

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