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akash
07-04-2020, 09:35 PM
Now we know at least 7 or 8 types different human species existed, perhaps even more. what is the exact reason they all vanished except present day human population? where did they all go or die out?

thejkhan
07-04-2020, 09:50 PM
Now we know at least 7 or 8 types different human species existed, perhaps even more. what is the exact reason they all vanished except present day human population? where did they all go or die out?

We ourselves are made of DNA from multiple lines of archaic humans. Itís just that we became more homogenous and lost the variation that once existed.

xenus
07-05-2020, 07:04 AM
Relative population sizes, adaptive advantages, the fact that during that time human species still had to fit a niche like any other animal. Some times the world changed faster than the other hominids and some times we moved into their niche.

MonkeyDLuffy
07-05-2020, 03:59 PM
I'd really recommend watching "Out of the Cradle" documentary. It explore number of factors what made us so successful in comparison to other hominids. We did mix with some Homos, but we were far more social, and the development of language helped us big time. We shared our knowledge of tool and weapons with other Homo Sapiens tribes, which other hominids failed to do.

RP48
07-05-2020, 05:58 PM
Outside of Africa, we can only guess why, for example, when AMH and Neanderthals met and even interbred, the succeeding generations were not 98% Neanderthal and 2% sapiens sapiens. We can postulate and theorize but cannot really know. Genetics tells us there were serious bottlenecks in both populations at times. We tend to look for reasons rather than “luck”. Sometimes being in the right place at the right time confers success more than being in the wrong place at the wrong time. It seems from the recently shared Bulgarian cave AMH genetic data that they were a line that failed to contribute to people today. Genes were not enough.

Henry Stevens
07-23-2020, 04:59 AM
Success in evolution is measured in reproduction and bringing (your) offspring to reproductive age, not strength, not intelligence, not relating to culture, reproduction. In general, animals living in the north reproduce once a year. That is, females come into heat once a year. In general animals related to those in the north mentioned above can reproduce more than once a year. That is, females come into heat more than once a year. Human females come into heat 12 times a year. What would happen if Neanderthal or Denisovan females came into heat 12 times a year in their northern environment? Those pregnancies would fail. In the north it is advantageous to breed at only certain times. So what happened when sapiens came north? Sapiens simply outbred the archaics because by then many of those pregnancies could be sustained by human cultural intervention.

In short, sapiens is in no way any better than any of the archaics excluding reproduction. But in reproduction, sapiens was easily the superior being. Sapiens outbred and swamped all related creatures.

thejkhan
07-23-2020, 05:08 AM
Success in evolution is measured in reproduction and bringing (your) offspring to reproductive age, not strength, not intelligence, not relating to culture, reproduction. In general, animals living in the north reproduce once a year. That is, females come into heat once a year. In general animals related to those in the north mentioned above can reproduce more than once a year. That is, females come into heat more than once a year. Human females come into heat 12 times a year. What would happen if Neanderthal or Denisovan females came into heat 12 times a year in their northern environment? Those pregnancies would fail. In the north it is advantageous to breed at only certain times. So what happened when sapiens came north? Sapiens simply outbred the archaics because by then many of those pregnancies could be sustained by human cultural intervention.

In short, sapiens is in no way any better than any of the archaics excluding reproduction. But in reproduction, sapiens was easily the superior being. Sapiens outbred and swamped all related creatures.

Your post doesn't explain why sapiens outbred non-sapiens in the southern regions. Also, strength, intelligence etc. counts because these are related to successfully bringing offspring to reproductive age without getting killed by predators, injuries, disease, climate.

RP48
07-23-2020, 12:15 PM
Mammalian species arise and change over time. Look at any ecosystem from 100,000 years ago. In the America’s there were saber tooth tigers, dire wolves, giant bison and moose, horse and camel species. All “gone” though in some cases they did contribute to modern species. Other cases, not. So the loss of H. erectus or H. heidelbergensis or H. floriensis should not surprise. Regarding Neanderthals, we do know their populations were small. That made their perpetuation more precarious.

Not sure we know the menstrual cycle of Neanderthals. Most hunter gatherer sapiens have low reproductive rates.

Henry Stevens
07-23-2020, 06:02 PM
Your post doesn't explain why sapiens outbred non-sapiens in the southern regions. Also, strength, intelligence etc. counts because these are related to successfully bringing offspring to reproductive age without getting killed by predators, injuries, disease, climate.

It is the same pattern if you assume any sort of seasonality. Southern animals sometimes breed twice a year. This pattern would be followed by archaics. When enough culture was developed it could change. The big genetic accident was it changed with sapiens. Nothing counts but reproduction and bringing your offspring to reproductive age. The most fit Americans between 1965 and 1995 were welfare mothers as an example.

Uzi
12-14-2020, 12:36 PM
I'd really recommend watching "Out of the Cradle" documentary. It explore number of factors what made us so successful in comparison to other hominids. We did mix with some Homos, but we were far more social, and the development of language helped us big time. We shared our knowledge of tool and weapons with other Homo Sapiens tribes, which other hominids failed to do.

Watched the documentary. Liked it, thanks for sharing.

MonkeyDLuffy
12-14-2020, 02:12 PM
Watched the documentary. Liked it, thanks for sharing.

I got subscription for curiosity stream just for that and Mosasauras documentary. They did an amazing job, even the CGI doesnt feel dated.

beyoku
12-19-2020, 10:09 PM
They tasted good over berries and tubers.

ThaYamamoto
12-20-2020, 05:43 AM
They tasted good over berries and tubers.

lool fr we ate them?!

MonkeyDLuffy
12-20-2020, 07:19 AM
lool fr we ate them?!

Hardly unlikely we ate other homos. But we probably did scavenge other primates or hominins. That's how we originally got Genital herpes lmao (I am serious, look it up).

ThaYamamoto
12-20-2020, 06:10 PM
Hardly unlikely we ate other homos. But we probably did scavenge other primates or hominins. That's how we originally got Genital herpes lmao (I am serious, look it up).

:biggrin1: :lol: :lol: :lol:

doanhmarket
01-04-2021, 08:55 AM
The vast and vast universe still has many things that humans cannot fully explore. Kind of like our aliens