JAMB - Biology (2006 - No. 16)

The intensity of competition among animals in a given area will increase with 
an increase in the frequency of disease outbreaks
an increase in population size
a decrease in immigration rate
an increase in the emigration rate

Explanation

An increase in population leads to competition because a larger number of individuals vying for the same limited resources (like food, water, mates, or territory) intensifies the struggle for survival and reproduction. 

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