Which example is a density independent factor? a. rainfall b. available food c. number of possible mates d. nesting space

The answer to this question would be: A. rainfall 

The density-independent factor would be the factor that will not changes in different density. 
Available food will be lower in higher density. The number of possible mates will be higher in higher density. Nesting space will be lower in higher density. Rainfall is the only factor that will not change if the density higher

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