I WONDER - How Long Have Bacteria Been On Earth? Me Pregunto - Cuánto Tiempo Han Estado Las Bacterias En La Tierra?

Bacteria are ancient life forms present everywhere, including the environment and human bodies. They are single-celled organisms. The human intestine hosts many bacteria. Bacteria were discovered in 1674 by Antonie van Leeuwenhoek.

What role do bacteria play in the human body?

Explain the significance of Antonie van Leeuwenhoek in microbiology.