One-fourth to one-half of our daily fluid loss occurs through

The correct answer is perspiration.

Explanation:

Perspiration or sweating refers to a natural cooling process of the body. When one feels too hot, the sweat glands present in the body stimulates to discharge moisture from the body in order to cool it off. As a drop of sweat moves out from the body, it also discharges a small amount of heat along with it.  

Sweating also hydrates the skin and sustains the balance of electrolytes within the body. The fluid one loses mainly comprises water and salt. In the case of extreme sweating, one can lose greater concentration of water, the process termed as dehydration. A normal body of a human being loses about one-fourth to one-half of the fluid daily via perspiration.