re: What makes a human?l

Well “human” is the layman’s term for “Homo sapien”. All known life forms on the planet are categorized in a taxonomic classification system. Sorting in this system as per Wikipedia use the following:

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There are some general practices used, however,[2][3] including the idea that a newly defined genus should fulfill these three criteria to be descriptively useful: monophyly – all descendants of an ancestral taxon are grouped together (i.e. phylogenetic analysis should clearly demonstrate both monophyly and validity as a separate lineage). reasonable compactness – a genus should not be expanded needlessly. distinctness – with respect to evolutionarily relevant criteria, i.e. ecology, morphology, or biogeography; DNA sequences are a consequence rather than a condition of diverging evolutionary lineages except in cases where they directly inhibit gene flow (e.g. postzygotic barriers).

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