Hormonal or pharmacokinetic components are more physiologically relevant. Niobium and some niobium alloys are physiologically inert and hypoallergenic. However, the golden jellyfish are morphologically, physiologically, and behaviourally distinct from the spotted jellyfish. Only the unbound calcium is physiologically active. This is one reason why homeostasis is physiologically necessary in many life forms. Anandamide is the precursor of a class of physiologically active substances, the prostamides. However, humans have found ways to adapt, both physiologically and tangibly. In general, humans appear physiologically well adapted to hot dry conditions. She said that perception, being determined physiologically, is incapable of error. Several dipeptides are physiologically important, and some are both physiologically and commercially significant. These zooids are attached to one another, physiologically integrated and cannot survive independently. The control of food intake is a physiologically complex, motivated behavioral system. The cells in the dorsal horn are divided into physiologically distinct layers called laminae. Hyperventilation is the term for having a minute ventilation higher than physiologically appropriate. Sexual orientation can be measured via self-report or physiologically.