Question

Read the following statement and choose the Correct characteristic feature of Aves (1)Skin of birds have glands (2)Air sacs help in excretion (3)Heart is having three auricle and one ventricle (4)Preen gland is present at the base of tail

Answer 1

Answer:

option no.4 is the correct answer

Answer 2

Answer:

Preen gland being located at the base of the tail of the Aves is the correct characteristic.

Explanation:

Aves

This class of organisms, commonly called birds, is a group of warm-blooded vertebrates, that bear feathers, lay hard-shelled eggs, and have toothless beaks. There are approximately ten thousand bird species and most of them are perching birds. They are said to be the descendants of the primitive avialans that appeared for the first time around $160$ million years ago in China. Birds are quite social in nature as they engage in activities like cooperative breeding, hunting, and flocking, and communicate vis sounds, calls, and visual signals.

Aves lack skin like ours that has sebaceous glands and sweat glands. The air sacs in their bodies are solely used for respiration. Further, the aves have four chambers in their heart having two auricles, and two ventricles.