| A | B |
|---|
| automatically | done unconsciously or spontaneously |
| nasal | relating to the nose |
| optic nerve | a nerve that sends messages between the eye and the brain |
| filter | prevent unwanted material or debris from |
| trigger | cause something to happen |
| reflex | an action that occurs as a response to a stimulus or outside influence |
| invaders | unwanted or harmful things that come into a place where they don't belong |
| confused | unsure of how to respond |
| pollen | a powdery substance from a flower that can cause some people to sneeze |
| phenomenon | an event or occurrence |
