Earth would basically look like the Moon; minus the craters, of course. This is because with no atmosphere to hold all of the Oxygen near the surface, all life would die off fairly quickly.
It mainly depends on the population size and technologies in the environment (Human Interference falls into that) .
<u>In order, the sub groups go:</u>
<em>life</em>
<em>domain</em>
<em>kingdom</em>
<em>phylum </em>
<em>class</em>
<em>order</em>
<em>family</em>
<em>genus</em>
<em>species</em>
<em>Therefore, D (Species), is your answer.</em>
