<span>The state in which the body's systems are functioning smoothly and in equilibrium </span>is called homeostasis.
<span>Homeostasis is the tendency to maintain a balanced (relatively constant) internal environment and it can also be defined as the stable state of an organism. Homeostasis is maintained at many levels, not just the level of the whole body (blood sugar levels, pH, fluid balance…). Each of these is controlled by one or more homeostatic mechanisms (feedbacks for example).</span>
You can tell that an organism is related to another organism by looking at their DNA. If they are similar, they are related. Another way to see if they look similar. For example, we are related to chimpanzees because we look similar and have similar DNA.
An equal number of protons and neutrons in an atom typically results in an atom that is radioactively stable.