Help please!

8.under the influence of gravity, matter in the solar nebula condensed into a dense central region called the protosun and a less dense outer ring called a(n) __ also known as a(n) __
a. propyld; inner planet
b. protoplanetary disk; proplyd
c. inner planets; outer planet
d. retrograde; rotation

12. to the nak3d eye, planets look like bright stars when they are viewed on earth
true or false ?

13. marvin the martian is a classic warner bros character. based on the traits of the roman god that gives mars its name, what would you expect marvin to be like
a. romantic and seductive
b. warlike and violent
c. tricky and clever
d. cold and distant

14. on planet earth, tai weighs 150 lbs how much would he weigh on mercury?
a. 15 lbs
b. 57 lbs
c. 200 lbs.
d. 300 lbs

15. what are believed to have caused the steep cliff-like north and south ridges that stretch over mercurys surface?
a. an impact from a moon-sized meteorite
b. early tectonic activity and tidal forces
c. giant solar flares ​