The major function of is to maintain fluid balance, body temperature, dissolve and transport substances, maintain blood volume and thus blood pressure, protect and lubricate tissues, and to eliminate toxic and/or excess substances.

It is the kidneys!

Explanation:

The kidneys in our body do make sure to maintain fluid balance, body temperature, dissolve and transport substances, maintain blood volume and thus blood pressure, protect and lubricate tissues, and to eliminate toxic and/or excess substances.

answerbps;