Final answer:
Aristotle would classify sharks using observable traits like their powerful jaws, multiple gill slits, fin types, reproductive methods, and specific snout shapes for various feeding strategies.
Step-by-step explanation:
Aristotle would classify sharks based on distinguishable biological traits. He focused on natural observation and first-hand examination of living organisms to determine their essence. Considering the information provided and Aristotle's approach to natural sciences, important traits for classifying sharks would include their powerful jaws with multiple rows of sharp teeth, their high number of gill slits, and various types of fins that can be used to distinguish between different species. The more specific characteristics such as ovoviviparous reproduction and the different shapes of snouts adapted to their prey (as seen in sawsharks, bullhead sharks, carpet sharks, and groundsharks) would also have been relevant to Aristotle's classification criteria.