Why are chromosomes visible under a microscope during cell division

Chromosomes are visible under the microscope during cell division, as because the chromatin has condensed and essentially the DNA with numerous histone proteins wrapped around and folded again and again to produce thick structures of chromosomes during prophase. The DNA replicated will condense and or wrap and fold to produce these thick structures.

Some of her  assignments would be creation of drugs. she is a medical chemist after all so she'd need to have the necessary knowledge to make medicine which can later be sold in a pharmacy 

Cuz i said so. which gives it to b