DNA replication occurs in the S phase. After that is G2, which is growth and final preparations for division. Chromosomes are checked for errors and repairs are made if needed. Essentially, the cell prepares for division.
I believe the answer I the third option
The thing that makes kes73 interesting to astronomers is ; ( A ) A second star.
kes73 is believed by astronomers to have come from the explosion of dying stars in the supernova. The gases from the dying stars explode and scatter across forming a colorful cloud known as kes73.
At the center of the colorful cloud formed from the gases of the dying stars is a second star ( magnetar ) which is the most powerful star in the galaxy due to its magnetic force.
Hence we can conclude that the thing that makes kes73 interesting to astronomers is the presence of a second star
Learn more : brainly.com/question/24245572