Answer:
probably A but its now seen as a law not a theory
Explanation:
i would look at the flashcards on a quizlet if there is one when you press it you can tend to find the anwser to ur questions
I believe the answer is: double-blind experiment
In double blind experiments, the subjects that receive the treatment is remained unknown by both the researchers and the subjects until the experiment is finished. The main purpose of double-blind experiment it eliminate the bias of perception that might exist among researchers.
Answer:
Nubian traders supplied Egypt with animal skins, ivory, ostrich feathers, and beautiful woods from the African interior. Nubia traded gold from its desert mines for Egyptian wheat.