The answer would be Prevent yourself from knowing what was in the pill bottles, and distributed the bottles randomly to the subjects
When researcher know which group got the treatment and which group got placebo, they might be biased. It will be better if the researcher is "blinded" and ask third party to help labeling the drug. The drug should be distributed randomly to makes the subject in control and treatment group as similar as possible.
Answer:
The Pentagon is the headquarters building of the United States Department of Defense. As a symbol of the U.S. military, the phrase The Pentagon is also often used as a metonym for the Department of Defense and its leadership.
Explanation:
Its described as 2n. <span />
Animals will migrate to other regions in search of food
The new species will evolve to survive in the deforested land
It's highly unlikely the animals will immediately adapt and the number of trees is decreasing because they're being cut down. Unless the question explicitly states that trees are being planted to replace those being lost.
