Reptilia, Aves and Mammalia · Zoology

The evolutionary success of mammals is mainly attributed to:

  1. External fertilization
  2. Scaly skin
  3. Endothermy and high parental care
  4. Dependence on aquatic habitats for reproduction
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Correct answer: Endothermy and high parental care

Endothermy allows mammals to inhabit diverse environments by maintaining a stable body temperature, while intensive parental care — nursing and nurturing offspring — greatly increases juvenile survival rates. Together these traits underpin the extraordinary adaptive radiation of mammals.

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