People had the means to pasteurize milk and make it safe to drink ...

[kshipps]

People had the means to pasteurize milk and make it safe to drink long before
  they began to do it. Why do you think it took so long for people to realize the
  usefulness of pasteurization?

 
  What will be an ideal response?

Question 2

Describe the differences you observed between the first sample of pond water
  and the heat-treated sample. What happened to the microorganisms?

 
  What will be an ideal response?

[blakcmamba]

Answer to Question 1

The development of microscopes was needed to observe and document the
existence of microorganisms. Years of research were needed to determine the role of
the microorganism in causing illness

Answer to Question 2

The movement of the organisms in the first sample should be much greater than
those in the heat-treated sample. The organisms and debris are present in the
treated sample, but they are no longer moving.

[kshipps]

Thanks for the timely response, appreciate it

[sultana.d]

Wow, this really help