Q.Some organisms are able to maintain homeostasis by physical means ...

Organisms respond to a changing abiotic environment in one of four broad ways. Regulators maintain a constant internal state (body temperature, ionic/osmotic balance) through active physiological means — seen mainly in birds, mammals, and a few lower vertebrates/invertebrates. Conformers cannot maintain a constant internal state, so it simply tracks the ambient environment, as with the osmotic concentration of many aquatic animals' body fluids matching that of the surrounding water. Migrators move temporarily away from a stressful habitat and return once conditions improve, as in Siberian cranes wintering at Vedanthangal in Tamil Nadu. Organisms that can neither regulate nor migrate may instead suspend ac …