Capitalism really is well aligned with nature and biology--no sarcasm tags required.
We should, of course, always beware of the Naturalistic Fallacy. Just because something is "natural" (or "well aligned with Nature and Biology") does not necessarily mean it is good, or that we should wholeheartedly support it.
There's probably an "Inverse Naturalistic Fallacy" too--just because something is "natural" doesn't mean it's bad, either. ("We must overcome our sinful natures to achieve salvation!")