Economics is the study of how societies use scarce resources to produce valuable commodities and distribute them among different people. Behind this definition are two key ideas in economics: that goods are scarce and that society must use its resources efficiently.
The correct answer is Glial cells; neurons
Glial cells are part of the nervous system. They are auxiliary cells that have the function of supporting the functioning of the central nervous system (CNS). It is estimated that there are 10 glia cells in the CNS for each neuron, but due to their small size, they occupy half the volume of nervous tissue. They differ in form and function and they are: oligodendrocytes, astrocytes, Schwann cells, ependymal cells and microglia.
Neurons are cells present in the nervous system and their main function is to conduct so-called nerve impulses. Although they are not the only cells in our nervous tissue, they stand out as the best known.
American states had to meet quotas of troops for the new Continental Army, and New England regiments recruited black slaves by promising freedom to those who served in the Continental Army. During the course of the war, about one-fifth of the northern army was black.
The correct answer is the spot stock warehouse
This is a type of a warehouse that is designed to fulfill the needs of a temporary demand and is not meant to hold certain things all the time. A spot stock warehouse would be great for the fireworks since they would only use them seasonally, that is, when the fourth of July starts approaching and then they could re-purpose it during the rest of the year.
Answer:
construction of the great wall ---> Zhou dynasty
use of metal coins -----> qin dynasty
construction of silk road-----> han dynasty
