1. Which of the following types of galaxies have the GREATEST masses?
A. Supergiant ellipticals.
2. Which of the following types have a small mass and are shaped like footballs?
C. Dwarf ellipticals.
3. Which of the following galaxies have starbirth taking place now in their disks?
B. Spirals.
4. Which of the following types of galaxies have the largest percentage of gas and dust?
D. Irregulars.