Keeping correct balance of ions and water in our body is called as:

Explanation

Osmoregulation is the process of maintaining salt and water balance (osmotic balance) across membranes within the body.Thermoregulation is a process that allows your body to maintain its core internal temperature.Excretion is a process in which metabolic waste is eliminated from an organism. In vertebrates this is primarily carried out by the lungs, kidneys and skin.Selective reabsorption is the process whereby certain molecules (e.g. ions, glucose and amino acids), after being filtered out of the capillaries along with nitrogenous waste products (i.e. urea) and water in the glomerulus, are reabsorbed from the filtrate as they pass through the nephron.