Answer: Water, vacuum and air molecule i guess
Explanation: XXXXXXXXXXX
The answer is constellations.
The answer would be the second option. The best reason for doing more background research after making an observation and before forming a hypothesis is to prevent making the same mistakes made in a prior experiment. It is to make sure that you are able to see the problems of a research and make an experimental design that will minimize the errors.
C. Cool weather. A warm front often brings cool weather.
