Physiological Adaptation
Internal biochemical and regulatory mechanisms enabling organisms to survive environmental extremes.
Real World
The Antarctic icefish (Channichthyidae) produces antifreeze glycoproteins that lower the freezing point of its blood, allowing it to survive in waters as cold as −2 °C where other fish would freeze solid.
Exam Focus
Clearly distinguish physiological adaptations (internal/biochemical) from structural ones (physical features) — misclassification is a common lost-mark error.
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