What first come chicken or egg

Which statement best describes the response by the united states and its allies to the berlin blockade? planes dropped tons of supplies around the city each day. trucks smuggled tons of supplies into berlin about once a week. tons of supplies were delivered to west berlin by boats. tons of supplies were purchased from east berlin each day.

Who did the first work in creating vaccines

What are three supporting points as to why opium was wrong in the chinese trade? why should it have stopped? (opium wars)