Answer:
B, A or D
Explanation:
Examples of secondary sources include: journal articles that comment on or analyse research. textbooks. dictionaries and encyclopaedias.
Answer:
War or a state of emergency
Explanation:
Mainly through better advancement in technology and our understanding of engineering. What with us going from living in caves to making wooden homes to now living in steel and concrete.
Answer:
I DONT KNOWAGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
Explanation: