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Animal randomization is the process of randomly assigning animals to treatment groups in an experiment. This is done to ensure that the groups are as similar as possible, and to reduce the risk of bias. There are a number of different methods that can be used for animal randomization, including: Simple randomization: This is the most basic method, and involves randomly assigning animals to groups without any regard for any other factors. Block randomization: This method involves dividing the animals into groups based on a certain factor, such as age or sex, and then randomly assigning animals from each group to treatment groups. This helps to ensure that the groups are more similar in terms of these factors. Stratified randomization: This method is similar to block randomization, but instead of dividing the animals into groups based on a single factor, they are divided into groups based on multiple factors. This helps to ensure that the groups are even more similar. The best method for