Easy
State the importance of the following:
$(1)$ Sebum
$(2)$ Counter current mechanism
$(1)$ Sebum
$(2)$ Counter current mechanism
(N/A) $(1)$ Sebum keeps the hair smooth and moist,and it prevents the dryness of the skin.
$(2)$ Counter current mechanism allows birds (Aves) and mammals to excrete hypertonic urine,which helps in maintaining the water balance in the body.
$(2)$ Counter current mechanism allows birds (Aves) and mammals to excrete hypertonic urine,which helps in maintaining the water balance in the body.
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