I remember reading about this in a book by Paul Davies
The thing is, complexity can evolve whether or not there is a "push"
from the universe telling it to. It can arise through evolution by simply
"diffusing" out. I know that is badly put, but it's hard to describe.
To use an analogy: Say I have a long box with sand up one end that I start
shaking. The sand will gradually distribute itself more evenly and thinly along
the box, but it will still be higher near end it started at. This will happen whether or
not the box is tilted to let it happen. In fact, the only thing that will stop
it happening is if the box is tilted to stop the sand moving.
So, the universe's push is analogous to the tilt (or more generally, the
shape) of the box. And the amount of sand at a given point to the number of species of a
given complexity. And each scenario will produce a different distribution.
The problem is, the complexity of an organism is hard to define, let alone
measure (what would the units be?), and the number of organisms at a given
complexity is nigh on impossible to measure for the ones where the distributions
differ the most: viruses, bacteria et al.
The big issue, to my mind, is how it all got started in the first place
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