The center of the milky way most likely contains a. empty space. b. a red giant star. c. a globular cluster. d. a supermassive black hole.

The center of the Milky Way most likely contains a supermassive black hole.

Explanation:

Because it is an eliptical galaxy, it has a little rotation to it but not enough to flatten out, thus the center would contain a supermassive black hole.

c

explanation:

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.