Q.Mammals are most adapted among the vertebrates. Elaborate.

Mammals are the most advanced vertebrates because they combine several superior features:

• Unique mammary glands nourish the young, along with hair on the skin and external ears (pinnae).
• A four-chambered heart and warm-blooded (homoiothermous) physiology allow high, stable activity levels.
• Differentiated teeth suited to varied diets, and limbs adapted for walking, running, climbing, burrowing, swimming or flying. …

Class Mammalia is described as the most advanced class of vertebrates, and several distinct features together justify this.

• Unique nourishing and protective features: the single most distinctive mammalian character is the presence of mammary glands, through which the mother nourishes her young with milk. Two further unique markers are hair on the skin, which provides insulation, and external ears (pinnae), which sharpen hearing.
• Efficient circulation and constant temperature: mammals have a fully four-chambered heart and are homoiothermous (warm-blooded), allowing them to keep their internal environment stable and sustain high, consistent levels of activity regardless of external conditions.
• Specialised feeding and movement: the jaw carries different types of teeth specialised for different functions, allowing a wide variety of diets, and mammals have two pairs of limbs adapted for an unusually broad range of activities — walking, running, climbing, burrowing, swimming or flying.
• Reproductive strategy: mammals are viviparous with a few exceptions (such as the egg-laying platypus), meaning most give birth to live young that have already developed inside the mother, and development is direct, with no larval stage — a more protected start to life than egg-laying or larval development. …

Method: Comparative-ranking scorecard across every vertebrate class

Rather than listing mammalian features and asserting they make mammals "most advanced," build a scorecard comparing mammals against EVERY other vertebrate class, one feature at a time, and let the ranking emerge from how consistently mammals score at or near the top of each row.

Scorecard, one row per feature, mammals versus the rest: