Homeostasis is the ability of body to maintain stable internal environment. This is possible only when all the internal body organs and systems are performing well. In order to achieve such conditions, all functions are to be maintained at cellular level such as food ingestion, digestion, excretion, material exchange, reproduction, obtaining energy from mitochondria etc.
If any of these functions is destabilized at cellular level due to change in external environment, then the overall internal stability of the body will get destabilized.
Homeostasis can be defined as the state of maintenance of the constant internal conditions by the living organisms. The homeostasis is maintained by the body so that it may function properly. The homeostasis will be disturbed by the reduced intake of the food and water. Healthy intake of water and food is essential in maintaining the homeostasis of the body. The elevated or depressed blood pH along with extreme body temperatures will also disturb the homeostasis of the body making the person sick. Moreover, certain infectious organisms also alters the homeostasis of the body.
Kingdom eubacteria does not belong with domain Eukarya because they are composed entirely of prokaryotic organisms eukaryotic life forms include animals fungi and plants
Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.
