Biology · ANIMAL KINGDOM
हिन्दीBoth Aves (birds) and Mammalia (mammals) belong to higher vertebrates. Which of the following sets contains ONLY those characters that are shared by BOTH Aves and Mammalia, without any exception?
Correct answer · Option 1
Homoiothermy, four-chambered heart, internal fertilisation, and respiration by lungs.
Explanation
Both Aves and Mammalia are homoiothermous, have a four-chambered heart, undergo internal fertilisation, and respire using lungs. Hair, pinnae, and mammary glands are exclusive to mammals.