Fertilizers contain nutrients that are essential to plant growth. List the three nutrients that appear on the label of fertilizers:______ ______ ______

43. According to the author, the use of chemicals and fertilizers ______.

The purpose of using chemicals and fertilizers is to increase the quality of foods.

1. Natural foods are rich inessential ____①____and ___②___.2. The use of chemicals and fertilizers is to increase the __③_not the _④___of foods.

Organic farmers do not use chemical fertilizers, genetically engineered seeds, or harmful chemicals to kill ___1___ and ____2___.

Organic food grown with natural fertilizers may be less expensive than those foods not utilizing natural fertilizers.

The major problem is the need for large quantities of water and ______ to grow the crops. A: food B: fertilizers C: pesticides D: chemicals

The major problem is the need for large quantities of water and ______ to grow the crops. A: fossils B: fertilizers C: frontiers D: fosters

According to the textbook, the latest technology that farmers have adopted is ______. A: artificial fertilizers B: pesticide C: tractors D: computers

Rivers, lakes and seas may be polluted by all of the following except ________. A: oxygen B: acid rain C: fertilizers D: waste material