A comet is close to the sun. How fast would you claim it might travel?

When the comet is far from the sun, it travels at about 2,000 miles per hour. As it gets closer to the sun, its speed increases. It may travel at over 100,000 miles per hour! As a comet approaches the sun, its icy body begins to melt, releasing gas and dust.

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.