Answer the following question given this paragraph: 

Bacteria are the most diverse and abundant group of organisms on Earth. They live in almost all environments. They are found in the ocean, the soil, and the intestines of animals. They are even found in rocks deep below Earth’s surface. Any surface that has not been sterilized is likely to be covered with bacteria. The total number of bacteria in the world is amazing. It’s estimated to be 5 × 10 30 , or five million trillion. You have more bacteria in and on your body than you have body cells!.


Q: What is the most diverse and abundant group of organisms on earth, numbering in the millions of trillions?

 Choices:

- viruses

- pests

- pathogens

- bacteria

A:
bacteria
