Is an experiment in which participants do not know if they are in the experimental or the control group, but the experimenters do know which participants are part of which group?

Explain how the political influence of african americans leaders became weaker.

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During a fierce storm a large number of tall trees on an island are uprooted by the wind and die. most of the trees on the island are now short trees and produce seeds that grow into short trees. what concept is shown in this example? question 5 options: natural selection artificial selection genetic engineering gene splicing