Biology

The correct answer is: B.They are found everywhere.

Eubacteria, also known as "true bacteria," are found in virtually every environment on Earth, including soil, water, extreme environments (like hot springs and deep-sea vents), and inside the bodies of animals and humans. They are incredibly diverse and abundant, making the statement that they are found everywhere true.

Here’s why the other options are incorrect:

A.They are all pathogenic: This is incorrect. While some eubacteria are pathogenic (cause disease), most are non-pathogenic and play essential roles in processes like decomposition, nitrogen fixation, and digestion. In fact, many are beneficial to humans and ecosystems.<...