Questions

What is Dipole :

when two atoms in a molecule have substantially different electronegativity: One atom attracts electrons more than another, becoming more negative, while the other atom becomes more positive.

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The human skin is made of 3 layers. They are ::

1) The Epidermis

2) The Dermis

3) The Hypodermis

Epidermis :: 

It is the outermost layer of skin, provides a waterproof barrier and creates our skin tone.

Demis ::

It is beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands.

Hypodermis ::

It is deeper layer and is made of fat and connective tissue.

The given sentence means that, at working hours that person is reserved means he is very timid, feel shy or not talkative or won't share his feelings.