Spanish Flu and the Bubonic Plague are two that I can think of off the top of my head
Answer: The Civil War started on April 12th, 1861 and lasted until April 9th, 1865.
Hope that helps!
Good Luck,
LaciaMelodii
Answer:
Improving Production.
Improving Distribution.
Adding to economic development.
Explanation:
Have a nice day.
It is very cold and has less oxygen
Answer:
Double blind experiment
Explanation:
Double blind experiment is used in experimental setting to avoid impartial judgement or error from biases. It involves the physician and the patient not being aware of who is getting the drug. In a study where the effect of a new drug is being tested, the medical researcher interacts with those participating in the study without knowing who is getting the real drugs and those getting the placebo [the substances that look like the real drug being used but are not]