Density-dependent factors include disease, competition, and predation. Density-dependant factors can have either a positive or a negative correlation to population size. With a positive relationship, these limiting factors increase with the size of the population and limit growth as population size increases.
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1 Keep the cooler or container in an area with good ventilation. 2  Carbon dioxide is heavier than air and will settle in the lowest areas of a room. 3  The best place for storing a container with dry ice is a garage or a room with a ground-level door or window that can be left open.