What did emperors rely on to govern the han dynasty

The flashing of directional signals as it indicates that used it safe to bed

This is science by the way which of the following is an example of an environmental pressure a. the air pressure in the atmosphere b. a lake that is gradually running out of water c. a fight between two members of the same species d. breeding between two members of the same species

Which allows college students to work part time jobs to pay for educational expenses ?