Explain how a population of insects could become resistant to a pesticide.

Consider the last statement in the prompt: "people take such environmental factors into account in their choices when deciding where to live." do all people have a choice as to where they live? what factor plays a key role in this decision and may therefore play a large role in determining quality of life?

How does the nervous system affect the excretory system?

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes