Alfred Crosby said he came upon the expression "Columbian Exchange" because

The impact of living organisms traded between the Old and the New World.

Explanation:

Historian Alfred W. Crosby came with the term “Columbian Exchange” to describe the impacts of the living organisms begin in the 15th century. With the discovery of America, in 1492, led the beginning of the Exchange between two continents. There was an exchange of native animals, plants, and diseases moving back and forth across the oceans. Europeans made trading connections with the natives and established colonies. The invaders came in with infectious diseases in the New World, that led to the decline of the entire civilizations. The Native American died with coming connecting with chickenpox, smallpox, scarlet fever, cholera, malaria, measles, etc.

the answer should be:

their party has more members.

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the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.