Trade helps maintain and expand civilizations by... a. having a good supply or even a surplus of natural and human-made resources, there is a demand for these resources, and trade (barter or use of money) is taking place in order to create a good economy.

b. having a good supply or even a surplus of natural and human-made resources, there is a demand for these resources, and no trade trade (barter or use of money) is taking place in order to create a weak economy.

c. having a good supply or even a surplus of natural and human-made resources, there is not a demand for these resources, so trade (barter or use of money) is not taking place in order to create a good economy.

PLS HELP I need it's due 4:00 pm EST

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 the environment of the northeast region affects the lifestyle of the people that live there

Acriterion for waiving informed consent is that, when appropriate, subjects are provided additional pertinent information after the study. in which of the following studies would it not be appropriate to provide subjects with information about missing elements of consent: a study in which researchers told students that they would be given a quiz after reading some study materials when the researchers did not intend to use a quiz, but were attempting to focus subjects’ attention on the material.a study in which subjects were told that they performed in the third quartile on an anagram task when in reality students were randomly assigned scores that were not related to their actual performance.a study in which subjects were assigned to study activities based on an undesirable or unflattering physical characteristic as assessed by members of the research team.a study involving decision-making games in which subjects were led to believe that they were interacting with another student in another room, but were actually interacting with a computer programmed to provide consistent responses to all subjects.