What are the two types of addition compounds

Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct