Answer:
Mass and density
Explanation:
Density of an object is defined as its mass per unit volume. Mathematically, the relation is given by :

m = mass and V = volume
If we know the density of the Eraser and its mass, we can easily find its volume. Hence, the two tools are mass and density.
Answer:
Because communism is a specific ideology in which private property and money are abolished, and people work only for their own pleasure. This is a theoretical stage developed by marxist theories that has never been reached.
An American politician calling for more government intervention can fall under a myriad of political ideologies: from social liberalism, to social democracy, to even democratic socialism. Thus, it is not accurate to label someone like that as "communist".
Answer:
Monarchs, Clergy, Nobles, Knights, Merchants, Artisans, Serfs
True
Stalin expelled his major
opponents from the political arena by the end of the 1920s. In the period of
1936 to the beginning of 1938. Most of them were physically exterminated. Stalin's
purges left behind few key players and set the slate clean for a new history of
Soviet communism.
"<span>D. Travel became difficult and dangerous as lawlessness increased and roads fell into disrepair" is the best option from the list, although this wasn't universally true. </span>