Please help me please

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.

How we perceive, use, study, structure, interpret, and react to messages of time is referred to as: ?

Giving into indirect pressure to change your behavior or thoughts is called?