Question

Presence of pinna, hair, mammary gland is a unique feature of which animals
O Balaenoptera
O Camelus
O Delphinus
a
O All the above​

Answer 1

all the above

Explanation:

The key characteristic features of mammals are the presence of placenta, skin with hairs, mammary gland, muscular diaphragm and giving birth young one.

Answer 2

The presence of pinna, hair, mammary gland is a unique feature of all of the mentioned animals. (option -All the above​ )

• Delphinus is the scientific name of Dolphin.
• Balaenoptera is the scientific name of Blue Whale.
• Camelus is the scientific name of Camel.
• All belong to class Mammalia of Animal Kingdom.
• all features mentioned - pinna, hair, mammary gland are features of Mammals.
• All of these have mammary glands and hairs on their body.
• external auditory meatus can be seen in adult Dolphins and Blue Whales.
• Blue Whales and Dolphins show the movement of mammals from land to water.