3 Select the correct answer.
What represents the value of the second-best alternative that a person gives up when making a choice?
OA marginal spending
OB. marginal benefit
OC. opportunity cost
OD. marginal cost

In which direction does the moving force of air flow? a-from warm temperatures to cold temperatures b-to areas of high pressure to areas of low pressure c-east to west d-from high elevations to low elevations

The ethnic conflicts in darfur have led to an attempt to destroy a whole people known as

Which statement best explains the relationship between an area's geography and the temperature of its surface water? areas at low altitudes have the warmest water because they receive the most direct sunlight. areas at low altitudes have the warmest water because they have the least change in temperature throughout the year. areas at high latitudes have the warmest water because their days are the longest. areas at high latitudes have the warmest water because they have the longest seasons.