I WONDER - How Long Have Bacteria Been On Earth?

Bacteria are omnipresent, found in the environment, on our skin, and within our bodies, especially in the gut. They are single-celled organisms that play a significant role in our bodily functions. The existence of bacteria was first discovered in 1674 by the Dutch scientist Antoine van Leeuwenhoek.

Where can bacteria be found in our surroundings?

• Only in the air

• Only in food

• Only in the ground

• In the environment, air, ground, skin, food, and bodies

What type of organisms are bacteria?

• Multi-celled organisms

• Complex organisms

• Single-celled organisms

• Non-living organisms

Which part of the human body contains the most bacteria?

• Gut

• Lungs

• Brain

• Skin

Who discovered bacteria in the human body?

• Albert Einstein

• Isaac Newton

• Marie Curie

• Antoine van Leeuwenhoek

In what year were bacteria in the human body discovered?

• 1574

• 1774

• 1674

• 1874