1. etymology new stone age 2. sedentary middle stone age 3. paleolithic the process of settling down in one location 4. mesolithic old stone age 5. neolithic the study of the origins of words

1. Etymology : the study of the origins of words .

2. Sedentary: The process of settling down in one location.  

3. Paleolithic : Old Stone Age.  

4. Mesolithic : Middle Stone Age.

5. Neolithic: New Stone Age

Explanation:

1. Etymology studies the history of words through the examination of texts and works about the language, in order to collect information about the way words were employed in the past and at what point they entered the language. Methods of comparative linguistics can also be applied to reconstruct knowledge of languages that are old and have no direct information available.

2. Sedentarism is the practice of living in one place for a long time and is the way most of the people live at the present.  

3. The Paleolithic was the Old Stone Age (1,000-12,000 b.c.)

when humans were nomadic.

4. The Mesolithic was the middle period in the development of humans between the Paleolithic and Neolithic periods (12,000-8,000 b.c.)

5. The Neolithic was the latest period of the Stone Age (8,000-5,000b.c.) when sedentarism developed.

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.

i normally just use