Answer: The frequency at which new species emerge and are lost over evolutionary time is established by the rates of speciation and extinction.
Answer:
Below.
Explanation:
Air pollutants.
Allergies.
Chronic sinusitis.
Lack of pertussis immunization.
Malnutrition (particularly in children)
Exposure to chemicals, fumes, and dust.
Smoke inhalation.
Answer:
True
Explanation:
there isn't a true answer in my opinion because everyone has a different opinion about certain things :p
