the answer would be the third option: the cells change after being exposed to the chemical, and this change is passed to the next generation of cells.
The two fundamental principles used in building cladograms are principles of parsimony and robusticity.
The principle of parismony states that the simplest of competing explanations is the one most likely to be correct.
The principle of rubusticity states that trees that maintains their basic forms even when different options are applied to the sequence of changes in one or more of their branches are preferable.<span />
The answer is in the image attached.
Hope this helps!
<span>methanogens
halophiles
thermoacidophiles</span>
