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What is common in Whale, Bat and Rat?

1. Absence of neck
2. Muscular diaphragm between thorax and abdomen
3. Extra-abdominal testes to avoid high temperature of body
4. Presence of external ears

Correct answer: Muscular diaphragm between thorax and abdomen

Solution

Whales, bats, and rats are all mammals, and a muscular diaphragm is a defining mammalian feature. It separates the thoracic and abdominal cavities and aids in breathing.

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