Hello! It is necessary for a scientist to do research prior to an experiment so they have more background on what they are going to examine. I hope this heps and feel free to rate my answer :)
The answer is D. There are nation that are divided into
states (also called federal governments) in countries with devolved structures
of government. These states are semi-autonomous regions and are allowed to
create their own local policies and laws. Example of a country with federal governments
is the United States.
the answer is B besuae when you are your losing somethings
