Doctors once believed that illness was caused by foul air and could not be transmitted from one person to another.
Now, doctors know that single-celled bacteria and even smaller viruses cause illnesses and can
be transmitted from
one person to another.
How did the advent of the microscope most likely affect the foul-air theory?
It supported the theory of foul air causing illness and helped the theory become a law.
A
•
It provided evidence for other causes of illness, but scientists did not change the theory.
O
It allowed scientists to change the theory before any
new information was collected.
O It allowed scientists to see small organisms in sick individuals and change the theory.