I am not good in statistics but i have to analize the following dataset:
I collect animals from different treatments (control, treatment A, treatment B, treatment C, treatment D and treatment E). For each treatment and control, I have replicate 1 and 2 (ex: Treatment A rep1, Treatment A rep2), and appr. 5 individuals per replicate.

I measure the size of the animals after a week, and I want to know if the size is impacted by the treatments. However, I would like to know first, if I can pool the replicates 1 and 2, or if there is difference in the replicates. How do I do it on R?

I am not sure how to do it.
I checked the data distribution for each treatment and each replicate, and the data is not normally distributed.