Consider three assertions:
A human is an animal.
A cow is an animal.
A goat is an animal.
Their specific kinds are different, but animality is a shared essential element in this classical logical analysis. Thus 'animal' functions as their genus. This is a teaching classification in classical logic, not a complete modern biological taxonomy.
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Why animal is the genus here
The Five Universals: Genus, Species, Differentia, Property, Common Accident
Consider three assertions:
A human is an animal.
A cow is an animal.
A goat is an animal.
Their specific kinds are different, but animality is a shared essential element in this classical logical analysis. Thus 'animal' functions as their genus. This is a teaching classification in classical logic, not a complete modern biological taxonomy.