Zayd and Amr are distinct persons. Their age, habits and physical appearance may vary.
Nevertheless, they agree in the specific human nature. Thus human is a universal predicated of numerous individuals sharing one species-essence.
Human is species for Zayd and Amr; animal is genus for human and horse, because these have different specific essences.
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The Five Predicables: Genus, Species and Hierarchy of Genera
Zayd and Amr are distinct persons. Their age, habits and physical appearance may vary.
Nevertheless, they agree in the specific human nature. Thus human is a universal predicated of numerous individuals sharing one species-essence.
Human is species for Zayd and Amr; animal is genus for human and horse, because these have different specific essences.