Pls help i need it like rn

Hurry ! between 1900 and 2010, how did the world’s population change? a. it increased from about 1.5 billion to almost 7 billion. b. it decreased from about 7 billion to about 1 billion. c. it increased from about 5 billion to about 7 billion. d. it decreased from about 7 billion to about 1.5 billion.

Identify three different reasons of why people have had to migrate and give examples to justify your reasons. use 3-6 sentences to explain your response.

If there were no system of checks and balance,the process of government would eventually fall apart. do you agree with this opinion? why or why not?