Op zondag 2 april 2023 om 07:42:32 UTC+2 schreef JTEM is so reasonable:
Now in the model I see, humans descend from an
Aquatic Ape population, but that we "Effectively"
had other ancestors....
These "Other ancestors" were themselves descended
from the Aquatic Ape ancestors, btw. They had at
some point peeled away from the mother group, pushed
inland and adapted.
So humans radiated out, following the sea, consuming
resources then moving on. That's how they got everyone
from Australia to southern most Africa, following the
coast.
And, groups were constantly peeling off, pushing inland.
This is a process that started almost immediately and
only ended when the modern world basically left no
more room for people to do this.
...the last to follow this Aquatic Ape model were the
"Pre Clovis" Americans and the Polynesians. They both
spread over the water before settling on land, pushing
inland.
The problem with this model is: Why the $#%& was
everyone so eager to push inland?!?!?
It's kind of like flightless birds: Secondarily flightless.
These are birds that can't fly which are descended from
birds that can. Flightless birds began evolving, from
flying birds, almost immediately!
And here we have humans, descended from the Aquatic
Ape population, CONSTANTLY pushing inland and
evolving...
Why? What is the allure?
I'm not sure what you're asking exactly, JTEM.
Are you asking why Hs doesn't dive any more?
why most Hs became +-exclusively terrestrial again?
(possibly often in parallel?)
I don't know:
- because it had become too cold, esp. at higher latitudes? ice ages?
- because we had acquired means to more easily live on land:
keeping wam & finding food:
e.g. speech? tools? fire? domestications? combinations of these? ...?
But the comparative anatomy is obvious:
-- Hs (vs Hn & He) had
-lost: POS, platycephaly, prognathism, streamline...
-reduced: nose size, wide body, broad forearms, flat feet...
-evolved: chin, flat face, high forehead, longer tibias...:
most of us walk, and don't dive any more, as you know,
but we can very easily re-adapt to the sea, of course: Polynesians etc.
-- Hn anatomy is clear:
they still dived parttime & probably waded,
you know my hypothesis, e.g.
Hn seasonally followed the river (e.g. Rhine/Meuse/...) inland.
In most senses, Eurasians are more primitive than Africans,
but there are still a lot of unsolved questions, e.g.
from where did the Hs LCA start? Middle East somewhere? when exactly?
why can't we drink sea-water (any more?)? but why do we need (some) salt?
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