Why did more people die from diseases in the 1800s?

A. Vaccines weren’t strong enough.
B. Pathogens were more resistant to medicine.
C. No one knew that germs existed.
D. People did not care as much about health.

PL HURRYYY

C. No one knew germs existed
Therefore diseases spread because they did not know how to prevent them and they did not have good hygiene.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.