The fact that we cannot have everything we want is caused by
a) scarcity
b) benefits
c) trade-offs
d) demand

Bonus question: according to wikipedia, in chinese philosophy yin and yang "describes how seemingly opposite or contrary forces may actually be complementary, interconnected, and interdependent." what are some examples from the story that amy tan may have intentionally incorporated elements of yin and yang philosophy into this story? select 2.

How did the growth of railroads american businesses expand

Which of the following statements most accurately describes the requirement for the documentation of minors’ assent to participate in research? parents must approve written documentation. documentation is required unless waived by an irb. to protect minors documentation is always required. federal regulations do not require the documentation of minors’ assent.