Passage Summary: While some think these tiny skeletons are just humans with medical issues, it's more probable they are a separate species that shrank over time, similar to the island's foxes and mice.

Conclusion: The small skeletons found on the island are likely a unique human species that evolved to be smaller due to their environment.

Reasoning: The skeletons do not match the characteristics of known growth disorders, and other local animal species have also evolved into smaller versions.

Analysis: I identified the conclusion by looking for the author's primary claim, which is introduced by the phrase 'It is more likely that...' This statement is the central point the author wants us to accept. The surrounding sentences serve as evidence, either by ruling out a competing theory (growth disorders) or by providing a parallel example of the proposed phenomenon (fox and mouse evolution). The focus here is strictly on the structural hierarchy of the claims.