How can pesticide use be harmful to human agriculture?

a. the loss of beneficial microfauna can reduce soil productivity.

b. pesticides eliminate harmful insect pests.

c. pesticides target the elimination of beneficial soil microflora.

d. the use of pesticides kills all soil microflora and microfauna.

We hold these truths to be self-evident, that all men are created equal, that they are endowed by their creator with certain unalienable rights, that among these are life, liberty and the pursuit of happiness." —declaration of independence how does this quote from the declaration of independence explain the idea of natural rights?