Answer:
B, A or D
Explanation:
Examples of secondary sources include: journal articles that comment on or analyse research. textbooks. dictionaries and encyclopaedias.
Answer:
by the Roman Emperor Constantine
Explanation:
National Education Association. Organized labor, or trade union is an organization of workers which has as its aim to fight for and improve the workers' rights.
The concept of nullification is a "legal theory that a state has the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional with respect to the United States Constitution (as opposed to the state's own constitution)."