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body temperature, an 1. adaptation that supports survival across varied climates. Hair and Fur: Presence of keratin-based hair or fur for insulation and sensory 2. functions. Mammary Glands: Production of milk for nourishing offspring, a hal

lian scales serves as an example of integumentary evolution. Similarly, the chapter may explore how the endothermic metabolism of mammals differs fundamentally from the ectothermic metabolism of amphibians and reptiles, affecting behavior, habita