A mold spore has a negative impact on the respiratory system.
Insects also have both a heart and a respiratory, or breathing, system.
A mold spore has a negative impact on breathing.
Mold spores have what impact on breathing?

(1) neutral
(2) ambiguous
(3) symptoms
(4) motility
(5) positive
(6) dangerous
(7) negative
(8) uncontrolled