To classify an organism a scientist finds in the field, which of these will the scientist first compare to other known organisms?

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs