It was Francesco Redi's experiment. In 1664 Redi wrote his first work Osservazioni intorno alle vipere(Observations about the Viper). Redi is best known for, published in 1668 as Esperienze Intorno alla Generazione degl'Insetti (Experiments on the Generation of Insects).
It proved that flies did not spontaneous generate. He put meat in a flask and covered it with cheesecloth so that air could get in but not flies. The other flask was a control and did not have cheesecloth. Only the flask without cheesecloth had flies.
experiment
What a person intends to do in an experiment depends on what the experiment is. Someone will need to know what the exact experiment is to know what they would do in it.
What is a variable in a experiment
the difference between activity and experiment is ...experiment is do
it depends on the experiment
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