MCQ
A character found exclusively in mammals, is:
- AInternal fertilisation.
- ✓Muscular diaphragm.
- CFour$-$chambered heart.
- DHomoeothermy.
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$A$. Phallic gland $B$. Urecose gland $C$. Nephrocytes $D$. Fat body $E$. Collaterial glands
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