Fish remove metabolic wastes primarily through their kidneys and gills.
- Aquatic animals like fish excrete nitrogenous wastes (like ammonia) directly into the water.
Why other options are less appropriate:
- Prawn, Crab, Snail also excrete wastes but typically through different organs adapted for their lifestyles, and the question generally relates to animals with well-studied excretory systems — fish are the classic example.
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