Geography test help me wit my test please

Which evidence is most likely used to indicate the beginning of solar system formation? a. materials combined to form a mass. b. materials were pulled together by gravity. c. water condensed and collected to form oceans. d. different species of microorganisms lived on earth.

Which was not a country that massively built up its navy in the early 1900s? germany china united statesbritain

How would you find the measure of one interior angle