Who to be friend and maybe more than that

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.

What does 2[tex] {2}^{ - 4} \times {2}^{ - 2} [/tex]

Arow of elements on the periodic table is called an