Can someone me with number two and four and number four has faded writing so don't mind that

Hello, gmoney5036. The main idea of the second paragraph is to inform why some insects are resistant to some pesticides. It tells how whenever they spray the pesticides and some survive, that their offspring will be able to be resistant, and it will grow greater with each new generation. For the fourth question, you could say something like "The insects survived due to their resistance of the chemicals used to kill them." I hope I helped!! Have a great day.