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.

Where can bacteria be found in our surroundings?

• Only in the air

• Only in food

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

• Only in the soil

What is a defining characteristic of bacteria?

• They are multi-celled organisms

• They have no cells

• They are composed of multiple cells

• They are single-celled organisms

Which part of the human body contains a large number of bacteria?

• The brain

• The heart

• The intestines

• The lungs

Who discovered bacteria and in what year?

• Albert Einstein in 1874

• Marie Curie in 1774

• Isaac Newton in 1674

• Antonie van Leeuwenhoek in 1674

What nationality was the scientist who discovered bacteria?

• French

• Dutch

• German

• Italian