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Nitrogen is used by plants for lots of leaf growth and good green color. Phosphorous is used by plants to help form new roots, make seeds, fruit and flowers. It's also used by plants to help fight disease. Potassium helps plants make strong stems and keep growing fast.

Answer:

We need nitrogen and phosphorus for the growing of algae and aquatic plants that help give food and a place for fish and other smaller organisms under water. It helps make an  DNA cell membrane, and also helps bone and teeth formation in humans. It also helps the food production this is because it is part of nitrogen potassium and phosphorus. There are used in fertilizer.

Explanation:

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