Aquatic adaptations

Water habitats have their own challenges: breathing, movement, pressure, visibility.

• Fish: gills extract O₂ from water, streamlined body, fins steer, swim bladder for buoyancy, scales protect.
• Dolphins & whales: mammals — breathe air through blowhole, hold breath long, blubber for warmth.
• Frog (amphibian): wet skin can absorb O₂, webbed feet, can live in water AND on land.
• Aquatic plants: soft stems (water supports them), leaves near surface, air pockets for floating.