List of bodies in the solar system by size

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.

These factors threaten north americas ecosystems

How many structures do prokaryotic cells have in common with the eukaryotic cells? a. 2b. 3c. 4d. 5