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A good starting point here would be to link sentences 5 and 3 based on the idea of “pruning.” Sentence 5 talks about the synaptic development that occurs during the early period described in sentences 4 and 2. It describes how synapses are initially overproduced, a concept that sets up the next part of the process: synaptic pruning. Sentence 3 continues this discussion by offering an explanation for why synapses are pruned: to reinforce the necessary connections and eliminate the weaker ones. This helps to fine-tune the brain’s wiring, ensuring that the important pathways are retained while the less useful ones are discarded. Together, 5-3 ties in with the broader purpose of neural wiring presented in Sentence 2: it emphasises that the creation of neural connections in the fetus is a preparatory stage and that these connections are essential for the future performance of the visual system. Sentence 4 sets the context of the paragraph: it mentions the formation of neural connections before birth, specifically focusing on the connections between the eyes and the brain.

While Sentence 1 provides a technical description of synapse creation and function, it doesn’t fit the broader context set by sentences 4, 2, 5, and 3. These sentences focus on brain development (especially related to vision) and the process of synapse formation and pruning in a developmental context. Sentence 1 focuses on the structural aspect of synapse formation (the “specialized structures” at the terminal end of an axon), which is more about how a synapse functions at a microscopic level rather than the larger developmental or functional role synapses play in early brain development, as discussed in the other sentences.
Therefore, Sentence 1 is the odd one out.