Presence of epidermal hairs on the skin / feathers on their wings
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Macropus - Ear pinna, body hairs, 4 chambered heart
Mammals can be divided into three more groups based on how their babies develop. These three groups are monotremes, marsupials, and the largest group, placental mammals.
The skin of mammals is unique in possessing hair. In mammals External ears or pinnae are present and 4 chambered heart is seen.
Macropus is a marsupial genus that belongs to the family Macropodidae. It has 13 species which are further divided into 3 subgenera. The genus includes all terrestrial kangaroos, wallaroos, and several species of wallaby.
As Macropus belongs to class Mammalia they are characterized by the presence of Ear pinna, body hairs, and 4 chambered hearts.
So, the correct answer is 'Macropus - Ear pinna, body hairs, 4 chambered heart'.
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