Explanation:
The presence and expansion of the railroad brought many advantages to the US. Among many, we could cite the fact that it made the western US more important nationwide. Before, the east coast it was not only the main country hub but also regarded as the only civilized one. Railroad facilitated the transportation of people, infrastructure and cargo to the west. That transportation made travel to that part of the country more affordable to people, increasing the west population, as well as increased economic relations between the east coast and the rest of the country. However, due to entering wild areas and in need of a high amount of wood to be made, It brought as well a high impact in the environment and increased racial conflicts with locals.
The 3Rs by Russell and Burch are known to be the "alternative methods" to improve the treatment of laboratory animals, at the same time to advance the quality of science that uses animals for studies.
The 3Rs are Replacement, Reduction, and Refinement. Replacement is defined as minimizing the pain and suffering of the animals used in research. Reduction is for reducing the number of animals being used, and using healthier animals. Replacement is using alternative to animals such as tissue cultures and computer models.
A blank is a fake bullet which fires just like a regular bullet but doesn't shoot anything. it's usually used to scare people away.
Neolithic Era and Paleothic Era
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<h3>Answers</h3>
In the order top to bottom:
1. Franks
2. Franks
3. Charlmagne
4. Charlemagne
5. Charlmagne
6. Clovis I
7. Charlemagne
8. Clovis I
9. Charlmagne
10. Early Franks
Kindly find the explanations in the attached document!
Hope this helps!