Melatonin I believ eis your answer. Not melanin like the pigment in our skin but melanin the sleep hormone.
Answer:
there's are no think I might to be a animal to a human .like examples of monkey etc.
When there is a cut on your skin, it gives bacteria and other organisms a gateway to enter directly into your bloodstream and could harm the body. By cleaning the wound, you prevent disease and infections from the bacteria.
Water has some unusual properties due to its hydrogen bonds. One property is cohesion, the tendency for water molecules to stick together. The cohesive forces between water molecules are responsible for the phenomenon known as surface tension.
One is optamistic feedback and another is pesimistic.
