Which of these is an effect of overcrowding in an environment?

a: increased food supply
b: increased competition
c: cooler temperatures
d: loss of habitat

Due to overcrowding, demand of food supply has been increased, no effect on temperature and habitat. In short, Your most appropriate answer would be: option B) "Increased Competition"

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Where are the subjestions

The id is the component of the personality that includes all of the individuals basic biological drives