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Explanation:
he has done this because British people recognise the name David more as it is common in the UK.
Answer:I think it is ecology
Explanation: because ecology study about the interaction between people and environment
B) harsh climate and transportation distances make it difficult and costly.
Chris's city is in a wet tropical climate.
High amount of precipitation, and warm humid climate is typical for the regions around the Equator, thus the climate in which Chris's city is located seems to belong to a tropical wet climate type, somewhere around the Equator.
Mark's city is in a cold desert climate.
The big variation of temperatures, with having hot summers and cold winters, as well as extremely low amount of precipitation, are typical for the cold deserts that are mostly dispersed in Asia, thus the city in which Mark lives will belong to a cold desert climate.
