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One of the following is a very unique feature of the mammalian body -
A
Presence of diaphragm
B
Four chambered heart
C
Rib cage
D
Homeothermy
Detailed Solution
A feature is unique to mammals only if no other group of animals has it.
Mammals have a muscular diaphragm that separates the thoracic cavity from the abdominal cavity and plays a major role in breathing. No other vertebrate group has a true diaphragm.
A four-chambered heart is also found in birds and crocodiles; homeothermy (warm-bloodedness) is also found in birds; a rib cage is present in reptiles and birds too.
(Mammary glands and hair are the other unique features of mammals.)
So the very unique feature of the mammalian body among the given ones is the presence of the diaphragm.
Mammals have a muscular diaphragm that separates the thoracic cavity from the abdominal cavity and plays a major role in breathing. No other vertebrate group has a true diaphragm.
A four-chambered heart is also found in birds and crocodiles; homeothermy (warm-bloodedness) is also found in birds; a rib cage is present in reptiles and birds too.
(Mammary glands and hair are the other unique features of mammals.)
So the very unique feature of the mammalian body among the given ones is the presence of the diaphragm.