Consider the following statements regarding the Haber-Bosch process and its impact:

1. The Haber-Bosch process allowed industries to develop cheap synthetic fertilizers, which contributed to a sevenfold increase in the world’s food supply during the 20th century.

2. Plants need reactive nitrogen in forms like ammonium (NH4+), nitrate (NO3–), and ammonia (NH3) to synthesize enzymes, proteins, and amino acids.

3. Lightning and microorganisms like Rhizobia are natural sources that can provide reactive nitrogen to the soil.