Scientific theories... begin as hypotheses

attempt to explain and relate large masses of data

are scientific guesses

are heavily supported by evidence

answer; /// i do believe that the correct answer is (d) majority vote as an approval requirement;

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!

well its is frequent rain

have a good day