| A | B | 
|---|
| antibiotics | medicines that kill microorganisms- especially bacteria | 
| bacteria | tiny organisms that are made of a single cell | 
| cells | the tiny structures that make up all living things | 
| claim | a proposed answer to a question about the natural world | 
| evidence | information about the natural world that is used to support or go against (refute) a claim | 
| infection | sickness caused by harmful microorganisms | 
| microbiome | all of the microorganisms that live in a particular environment such as a human body | 
| microorganism | an organism that is too small to be seen with the naked eye | 
| microscopic | too small to be seen with the naked eye | 
| organisms | living things such as plants- animals- and bacteria | 
| population | a group of the same type of organism living in the same area | 
| reasoning | the process of making clear how your evidence supports your claim | 
| scale | the relative size of things | 
| scientific argument | a claim supported by evidence |