Conclusion
This paper discusses the evolutionary relationship between cognition and some brain features such as brain size, the density of neurons, and hormones, which play important roles in different aspects and types of cognitive abilities in animals. Besides, we also compared and pointed the effect of different brain structures, which have undergone many changes and differentiation during the evolution in invertebrates and vertebrates clades, on altering and consolidating cognitive abilities. However, we mentioned that the correlation between brain development and cognition is not always direct. There are some exceptions in some animal groups and species.
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