Use the excerpt from the text titled "Making Medicine: From Discovery to Doctors" to answer the question.
The first step is to scour molecule 'banks,' which store millions of molecules other scientists have made. Intelligent computer programs, robots, and other state-of-the art tools help scientists analyze thousands, sometimes millions, of molecules and discover those that might have the desired effect on our bodies."
Which phrase from the excerpt signals that this is a chronological text?
O scientists have made
O the desired effect
O the first step
O sometimes millions