A probe is a spacecraft that travels through space to collect science information. Probes send data back to Earth for scientists to study. Mercury, Venus, Mars, Jupiter, Moons of Mars, and Moons of Saturn.
Answer:
C. the total number of people living in an area
Explanation:
Answer: They have larger ranges and thresholds.
Explanation: The rank-size rule defines range as the longest distance that a customer will travel to purchase a good or service. Threshold is the minimum market needed to support the supply of a product or service. It is assumed that customers which travel longer distances to purchase a higher-order good or service, and a provider of such goods and services will require a larger customer base to make a profit. Thus, higher-order services have larger ranges and thresholds.
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