propel it forward in water
steer it while changing direction
balance it in water
enable it to float in water
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• Caudal/Tail Fin - Fin on end of fish; used to propel the fish.
• Dorsal Fin – Backside (top) fin on a fish; used for balance and protection.
• Pectoral Fin – Side (“chest”) fins on a fish; used for balance and steering.
• Anal Fin - Last bottom fin on a fish located near the anal opening; used for balancing and steering.
• Pelvic Fin – Paired bottom or belly fins on a fish; used in balance and steering.
• Gills - Organ a fish uses to obtain oxygen from the water.
• Operculum - Flexible bony plate that covers the gills.
• Lateral Line - Organ a fish uses to “feel” low vibrations; tiny microscopic pores.
• Nares - Organ a fish uses to smell; similar to nostrils but not used for breathing.
• Scales - Protective cover on a fish; similar to skin.
• Slime - Covers scales; layer protects from bacteria, parasites, etc.
• Vertebrate - Organism with a backbone.
• Superior Mouth - A mouth that opens upward (usually surface feeders).
• Inferior Mouth - A mouth that opens downward (usually bottom feeders).
• Terminal Mouth - A mouth located at anterior end of fish’s body (mid water feeder).
• Camouflage – The ability to blend in with the background or habitat.
• Adaptation - The adjustment or change in behavior or body to become better suited for survival in a particular environment.
ref: www.dec.ny.gov

The caudal fin is the tail fin (from the Latin cauda meaning tail), located at the end of the caudal peduncle and is used for propulsion.
So the correct answer is A📌

