Aprocess that uses observation and experimentation to gain knowledge is

A process that uses observation and experimentation to gain knowledge is called science.

answer; i believe that the correct answer is (d); // supercontinent

hello,

answer: a federal government has final authority on interstate/inter provincial  and international affairs, a confederation is one where the central/national government or authority is governing body what does not have final say over the same matters. hopefully this and i will try again if you don't like this answer : )

best of luck!