Which of the following is a characteristic of | vedclass

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(D) The class $Mammalia$ is characterized by several unique features. $1$. The presence of $mammary$ $glands$ (milk-producing glands) is the most defi

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Muscular diaphragm and mammary glands

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(D) The class $Mammalia$ is characterized by several unique features. $1$. The presence of $mammary$ $glands$ (milk-producing glands) is the most defining characteristic of mammals,used for nourishing their young. $2$. The $muscular$ $diaphragm$ is a unique structure found in all mammals that separates the thoracic cavity from the abdominal cavity and plays a crucial role in respiration. $3$. While other features like viviparity or heterodont teeth are common,they have exceptions (e.g.,$Ornithorhynchus$ or platypus is oviparous). $4$. Therefore,the presence of a muscular diaphragm and mammary glands are the universal characteristics of all mammals.

Which of the following is a characteristic of all mammals without any exception?

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Assertion $A$: Mammals are viviparous.
Reason $R$: In mammals,the developing embryo receives nutrition from the maternal body and is born as a living offspring.

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