<em>Consistency:</em> Consistency is the property of the phenomena where the result of the observation or experiment should be consistence. The degree of the variation between the observation should very low.
<em>Observable: </em>The outcome of the result of the experiment should be observable and the result should be record able.
<em>Natural:</em> For the happening of the event, it should be explainable with the reference of the natural events.
<em>Predictable: </em>The event should be able to predict that can be explained on the basis of the naturally occurring event.
<em>Testable:</em> the cause of the natural event should be able to tested on the basis of variable environment in controlled environment to draw the different result and a conclusion based on the result.
<em>Tentativeness: </em>the scientific theory should be such that it could be tested upon. With the development of science, the theory should be modifiable and even proven wrong.
If two modern organisms are distantly related in an evolutionary sense, then one should expect that <span>they should share fewer homologous structures than two more closely related organisms.</span>
