Match each vocabulary word with the correct definition.

filter

• a nerve that sense messages between the eye

  and the brain

• prevent unwanted material or debris from

  passing through

• cause something to happen

invaders

• an action that occurs as a response to a

  stimulus or outside influence

• unsure of how to respond

• unwanted or harmful things that come into a

  place where they don't belong

phenomenon

• an event or occurrence

• a powdery substance from a flower that can

  cause some people to sneeze

• unsure of how to respond

automatically

• done unconsciously or spontaneously

• relating to the nose

• a nerve that sense messages between the eye

  and the brain

pollen

• unsure of how to respond

• a powdery substance from a flower that can

  cause some people to sneeze

• an event or occurrence

optic nerve

• done unconsciously or spontaneously

• relating to the nose

• a nerve that sense messages between the eye

  and the brain

trigger

• cause something to happen

• an action that occurs as a response to a

  stimulus or outside influence

• unwanted or harmful things that come into a

  place where they don't belong

nasal

• a nerve that sense messages between the eye

  and the brain

• done unconsciously or spontaneously

• relating to the nose

reflex

• an action that occurs as a response to a

  stimulus or outside influence

• unwanted or harmful things that come into a

  place where they don't belong

• unsure of how to respond

confused

• unwanted or harmful things that come into a

  place where they don't belong

• unsure of how to respond

• a powdery substance from a flower that can

  cause some people to sneeze