Basically let's you breathe easier.
Explanation:
The alveoli are only one cell thick. Which allows relatively easy passage of oxygen and Carbon Dioxide between the alveoli and blood vessels. (Capillaries
Answer:
Number 3 is “dark”
After the Industrail Revolution, there was a large growth in dark peppered moth population.
East to West
A is the best answer
Louis Pasteur was the scientist who confirm that bacteria and other microorganisms is the reason for variety of diseases.
