Pasteur reasoned the factor that made the bacteria less deadly was exposure to oxygen. The discovery of the chicken cholera vaccine by Louis Pasteur revolutionized work in infectious diseases and can be considered the birth of immunology.
Answer:
Answer is 3. Hope this helps!
Explanation:
A The continents were once joined together
Explanation:
All the continents were once together making a huge one called Pangea.
It is about 4.22 light-years<span> from Earth and is the closest star other than the sun. Alpha Centauri A and B orbit a common center of gravity every 80 years. The average distance between them is </span>about 11 astronomical units<span> (AU) — about the same distance as the sun is to Uranus.</span>
The alveoli are surrounded by tiny blood vessels, called capillaries carrying blood to and from the heart.
