Agrowing human population means more food is needed. improvements in farming can meet this demand. which of the following have provide more food?
fertilizers, pesticides, and more efficient farming practices
more people following a vegetarian diet
an increase in the number of farmers willing to work long hours
an increase in the number of people moving away from the city to live on farms

The answer is definitely the first one, the reasons are: A.) Fertilizer helps plants grow faster and they help the plant produce more.

                                                                                      B. ) Pesticides kill harmful insects that would otherwise ravage the food supply. 

                                                                                      C.) The easier it is to farm, more food you can make in a short amount of time. Allowing for higher food production.

i am positive it is c. condensing but i may be wrong

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.