Probably respiration (breathing), perspiration (sweat) urination + deification
Breatheing, sweating, extraction by the kidneys to make urine, and loss through the large bowel because of inefficient water reabsorbtion. Tears,mucous secretions from the nose and elsewhere are insignificant sources as is spitting.
Body water loss from the skin is known as insensible perspiration, while body water loss from the lungs is known as respiratory water loss. Both processes contribute to overall fluid loss and help regulate body temperature.
Loss of water from our body can lead to becoming dehydrated.
The scales on the fish body helps it to reduce water loss.
Blubber, or subcutaneous fat, helps prevent heat loss from the body. Keratin in the epidermis helps prevent water loss from the body.
Too much creatine would create an excess of ATP in the body and i think due to the hyperactivity of major metabolic processes in the body it can cause a major loss of water(dehydration)
The loss of body heat when in the water
The water loss is due to sweating to cool the body.
A major function of the epidermis is to prevent water loss. The outermost layer of the epidermis, called the stratum corneum, acts as a barrier to prevent excessive water loss from the body. This barrier function helps to maintain hydration and protect the deeper layers of the skin.
Drink a lot of water
it's covered with cuticle
dehydration