Select all that apply.

to increase agricultural production, the tang dynasty

1. encouraged foreign trade

2. constructed waterwheels

3. built dams to provide for irrigation

4. converted bad land into agricultural fields

5. invented new farming methods

possible the invasion of room could have been avodiable but the people of rome were to stubboron and to wealthy the kingdoms saw them as a threat if they dialred it downa   bit ten i dont think they wouldnt failed   china was not iacvvdoaible they caused war to much and were out of hand therefor that must have happened india i dont really know it could of