Writers of mass media should watch out for and eliminate phrases or sentences that do not contribute anything to the content. what is this technique called?

Text editing.

Explanation: It is a technique who has a great importance because, beyond, monitoring and eliminating "undesirable" text, it seeks to make the edited document more enjoyable for the reading of its users, while also being a valuable source of information and reference for next surveys.

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.

answer; no longer than a reasonable period of time;