Astronomers suspect that a galaxy's type can be affected both by the conditions in the protogalactic cloud from which it forms ("initial conditions") and by later interactions with other galaxies. each item below describes either a condition n a protogalactic cloud or a later interaction. match these items to the galaxy type you would expect to form as a result.
1. stars form rapidly as the protogalactic could shrinks
2. most protogalactic gas settles into a disk
3. protogalactic cloud has high density
4. a galaxy collision strips away gas
5. protogalactic cloud rotates very slowly
6. protogalactic cloud has high angular momentum
a. elliptical galaxy
b. spiral galaxy