The file above is a scam file
Damage is caused to an ecosystem by adding fertilizer because some of the substances to the fertilizer is toxic or create bad reactions.
Pardon? I don’t understand the question
There are lots:
Biology and Medicine - cloning and expression of human insulin in bacteria (stopped having to produce it from pig pancreases); Watson & Crick discovery of the structure of DNA; gene therapy in humans
Chemistry - determination of the exact number of molecules in a mole (Avagadro's number); discovery of radioactivity (Rutherford); the invention of nylon (DuPont); Boyle's law (behavior of gases)
