>My personal opinion is that nothing is left over, or anyone. Life is >too
>complex to understand, including extinction. Since perhaps, if there is
>a plan, it has the same within it (as happens with the dinosaurs), and
>if not, simply, who is killed is because he deserves it. And here, we
>can have a reference to Darwin theories.

Or even more modern ideas than Darwin (if you consider that there is no
plan), like those of Lynn Margulis:

"Natural selection eliminates and maybe maintains, but it doesn't
create", and maintained that symbiosis was the major driver of
evolutionary change."

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https://en.wikipedia.org/wiki/Lynn_Margulis