You are presented with the question "What are commonly found in soil and water?" and the following answer choices: 
- lava
 - bacteria
 - phytoplankton
 - bacterium
 - diamonds
 - Acids
 - parasites
 - hydrocarbons

Now knowing that endospores are commonly found in soil and water and when inside a bacterium, the spore is called an endospore , choose the best answer.


 

    bacterium     