Skin

The skin assists in the process of excretion of water, salts, etc. The human skin does not involve in absorption of water and minerals.

Cornified layer (stratum corneum) is the outermost layer consisting of several piled up layer of flattened dead cells.

The optimum range for normal body temperature is 35°C - 40°C. 

Lucoderma or vitiligo is the abnormal condition of skin in which skin pigment (melanin) is lost from smaller or larger patches at different region of the body.

Nausea is caused by hyper secretion of sweat glands, not sebaceous glands.

The outermost layer of epidermis called 'stratum corneum' consists of flattened dead cells, which are made of a horny protein named keratin.

 Stratum basale separates dermis from epidermis.

The contraction of arrector muscle causes the lifting of hair.

The malphigian layer is the innermost region of epidermis. The melanin, a skin pigment is present in this layer, which is responsible for the colourisation of skin.

'Hypothalamus', a portion of forebrain acts like thermostat. When the body tends to cool, it speeds up the heat producing process and when the body tends to get overheated, it accelerates the cooling process.

Heat is lost form our body through skin, lungs, urine and faeces, etc.

The increase in the supply of blood to skin by widening the blood vessels is called vasodilation. This results in greater loss of heat from body.

Hibernation is the condition, in which animals become inactive through cold weather.
For example, Rabbits, Lizards, etc.

Ceruminous glands secrete earwax in the auditory canal, Meibomian glands are in eyelids, Sebaceous glands are found in skin, and Mammary glands are in nipples. This is the correct anatomical distribution.

Poikilotherms have variable body temperature (c), Homotherms maintain constant temperature (a), Ectotherms gain heat from outside (d), and Endotherms generate internal heat (b). Option B correctly matches all pairs.