Answer:
Below.
Explanation:
Air pollutants.
Allergies.
Chronic sinusitis.
Lack of pertussis immunization.
Malnutrition (particularly in children)
Exposure to chemicals, fumes, and dust.
Smoke inhalation.
I think the answer is A but I’m sooo sorry if I’m wrong
It usually mean you have a infection or have kidney failure.
an organ system is a group of organs that work together for a common function. the order goes cells, tissues, organs, organ systems, organism.
