Keep the comparison explicit:
Animal is the genus when humans, cattle and goats are compared as different species.
Human is the species when Zayd, Amr and Bakr are compared as individuals.
The book also uses 'growing body' in broader classifications involving plants and animals; its further hierarchy need not be mastered yet.
Always ask whether you are classifying individuals within one kind or comparing several kinds.
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Logical roles depend on what is being compared
The Five Universals: Genus, Species, Differentia, Property, Common Accident
Keep the comparison explicit:
Animal is the genus when humans, cattle and goats are compared as different species.
Human is the species when Zayd, Amr and Bakr are compared as individuals.
The book also uses 'growing body' in broader classifications involving plants and animals; its further hierarchy need not be mastered yet.
Always ask whether you are classifying individuals within one kind or comparing several kinds.