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HalpMehPurrtyPlz
The term for this would be density because for every square of land that is 1 km by 1 km (km 2), there is 137 rabbits. Hope I helped!
There are two terms: Population = 137 Rabbits
& Area = per km2

We can calculate/define Population Density" from this data by:
Population density = number of individuals / per unit area (in Km²)

In short, Your Answer would be "Population Density"

Hope this helps!