Your coworker is writing her first formal report. as you are proofreading the report for her, you notice she doesn't have a letter or memo of transmittal. when you tell her it is missing, she asks you about the purpose of the letter or memo of transmittal.

A letter or memo of transmittal acts as an introduction to a formal report.

Answer choices are:   acts as an introduction to a formal report;  lists the figures used in a report;  provides a place to record the headings and page numbers in your report.

A letter of transmittal is a covering letter which allow the reader to understand the importance of the report attached to it.  It also establishes a  relationship between the writer and the reader. When your coworker asked about the purpose of the letter or memo of transmittal, tell her that a letter or memo of transmittal acts as an introduction to a formal report.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.