What is the actual weight of the earth?

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 are the answers for the following questions?

Ineed , i need to create a power point in life science here is a picture explaining a little what the topic is about, me with some information for my slides : (