What are three reasons why nebulae contribute more to stellar formation than other regions of the universe? a. they are rich in hydrogen and helium. b. they have an unlimited supply of hydrogen. c. they are far away from black holes. d. they are dense and hot. e. they have a strong gravitational pull.

Options A, D and E.

Explanation:

Nebulae are region where stars and planets take birth. These are molecular clouds of dust and gas. These clouds are rich in Hydrogen and Helium. The dense and hot cloud collapses under its own weight. It then condenses and forms a disk which stars rotating. The central core forms the star and planets form from the rest of the material.

Hence, option A, D and E are correct.

whichever one it is, it's definitely not one that you included on the list you provided.

no simpler subs form complex ones. synthesise = make