Use the following to answer questions :
Suppose a rodent species can either live alone or in groups.Group living affects the chances that the rodents will acquire parasites,susceptibility to predation,and also affects thermoregulation.Three different populations of marmots are affected by group living in different ways-the chart below shows the benefits (positive numbers) and costs (negative numbers) for each of these factors in the three populations where the benefits and the costs are in the same units for each of the factors. 
-If the thermoregulation effects were not a factor,in which populations would you expect to find group living?
Definitions:
Fresh Water
Fresh water is water with a low salt concentration, found in rivers, lakes, streams, and underground aquifers, essential for drinking, agriculture, and industry.
Scarce Resource
A resource that is limited in availability and can be used up or depleted, making it valuable and subject to economic study for optimal use.
Unlimited Wants
The economic concept that humans have endless desires for goods and services.
Good
A tangible product used to satisfy human wants.
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