Draw a labeled diagram of the generalized vertical section of the mammalian skin.

Draw a labelled diagram of the generalised vertical section of the mammalian skin.

Label the parts numbered from 1 to 9

State one main function of the following part-

Part 2

State one main function of the following part:

Part 3

State one main function of the following part:

Part 4

State one main function of the following part:

Part 9

Part 4 may add to one’s good appearance or the “figure”. State one example of this function which may be common to both men and women. 

This structure in birds is a counterpart of mammalian hair.

What is this?

What is the one common primary function served by these structures both in birds and mammals?