Population density is the study of how many people live in some area as compared to other areas - this helps for example predict whether the area can preduce enough food for itself. It is measured in the number of people per a unit of area.
The correct answer then is:
<span> the number of people who live in a square mile or kilometer</span>
Double headed arrows indicate positive or negative effects of one variable on another
Answer:
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I don't know sorry
Please please please I'm sorry I literally don't know