"A stress researcher wants to look at the effect of meditation on anxiety. To do this, she creates two groups of subjects: one group receives instruction in meditation, whereas the other receives no training at all. One month later, she has subjects complete a questionnaire designed to measure anxiety and she looks to see whether there are any differences in anxiety between the two groups. In this experiment, the meditation condition (meditation vs. no meditation) would be the variable and anxiety would be the variable."

independent, dependent

Explanation:

For instance, one is interested in how stress affects heart rate in humans.

Therefore,

The independent variable would be the stress and the dependent variable would be the heart rate. One can directly manipulate stress levels in the human subjects and measure how those stress levels change heart rate.

in 342 bc j._c. egypt fell into the hands of the persians, under the reign of nectanebo ii

greek city-states unite in a revolt against the persian empire at the beginning of the fifth century bc. j.-c  

from the year 660 or 659 bc ad, cyrus preached the revolt against the medes to deliver the persians.

c. wright mills's sociological imagination suggest investigating to explain this increase?