Questions tagged [human-evolution]

The study of evolution with a particular focus on questions about the evolution of modern humans.

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Is Race the Result of Microevolution

I've been studying evolution for some time and was wondering whether the emergence of different races is an example of micro evolution within our species? Bonus Question: is it impossible for homo ...
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129 views

Why did many species of Homo and their ancestors evolve in East Africa?

One thing I find interesting about the theory of evolution is the idea that Homo Erectus and Habilis evolved in Africa, began to spread around the globe, then was superseded by Homo Sapiens Sapiens ...
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Brain capacity of Cro-magnon man vs Modern man

Cranial capacity of Cromagnon man was about 1650cc whereas average cranial capacity in modern human is 1450cc. My question is, why during the course of evolution, a reduction in cranial capacity is ...
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590 views

Neanderthal and modern human population sizes

Are there any estimates of both the modern human and Neanderthal population sizes over the last, say, 100 k years? Since "purebread" Neanderthals are extinct, their population has to hit zero; that ...
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56 views

Why has the human eye evolved to become sensitive only to the visible light? [duplicate]

The human eye has evolved to become sensitive only to visible part of the electromagnetic spectrum. Why? Why is infrared vision disfavoured for us by evolution but not for some other animals? I am not ...
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170 views

Would prehistoric humans have been considered negroid or australoid by modern standards? [closed]

What are your thoughts about this? For myself I think that the subject statement is rather obvious isn’t it, since Africans, & especially Australian Aboriginals, have the most archaic features &...
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258 views

Why is melanin black? [duplicate]

I understand that the function of melanin is to protect individuals from sunlight, and that people living in sun exposed areas are darker due to increased production of melanin. But why is the melanin ...
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86 views

Does drying meat in the sun make digesting it easier?

I was looking into the relationships between man, fire, brain size, evolution, etc. and I learned about other methods of food preparation that eased digestion, but did not use fire. Then, this ...
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371 views

Why does the right bundle branch not have any terminal filaments in the IVS of the human heart?

Dubin's "Rapid Interpretation of EKG's" briefly describes this part of human physiology but doesn't explain the reason behind it. Is there a specific advantage of the human heart having this ...
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605 views

Why don't humans typically drink human milk after infancy?

Does any human culture routinely do this? Typically taboos have some evolutionary basis. So what would that be? Does any mammal drink the milk of its own species, besides nursing?
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How do our sensory organs work automatically without our conscious effort? [closed]

I wonder how our different sensory organs (e.g., eyes, nose, ears, etc.) work automatically without our conscious efforts or without our command. We don't have to tell our eyes how to see, our ears ...
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86 views

Why human endometrium doesn't stay constant? [duplicate]

Is there any explanation or evolutionary advantage to the endometrium constantly cycling between the proliferative and menstrual cycle? Wouldn't it be more advantageous if it kept always fully ...
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Why a brain's hemisphere controls the opposite side of the body? [duplicate]

As a physics student with very little understanding of biology, in a course about physics foundations diagnostic techniques I have come up with this question. I don't even know if it does make sense ...
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What percentage of a Neanderthal's DNA could be in a Denisovan?

My questions arose from an online course video at 3:11-19 The professor mentioned that the Neanderthals were inbred with their cousins breeding together but the Denisovans were very diverse , with 70%...
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Does the rate of human evolution change over time?

Weakening the natural selection would increase the rate of evolution. This is because mutations aren't removed as efficiently – this increases their frequency. However, this is not the result of ...
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Biological & Evolutionary Reasons for Palm (Bi)Symmetry

The fingers of the human palm exhibit a (bi)symmetrical pattern with regards to their size, in the sense that the thumb and the pinky are almost the same size, and the same holds for the index and ...
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What is the scientific consensus on whether humans were monogamous during the period of evolutionary adaptedness?

The book The Mating Mind by Geoffrey Miller asserts, as part of its thesis, that humans were not monogamous in the environment of evolutionary adaptedness. I found the book vivid and persuasive, but ...
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54 views

Why does it seem like there is very little disparity between races in regards to intelligence

There is numerous biological difference between human races, from height to average BMI to various organ size. Oddly however there is very little disparity in regards to intelligence (when accounting ...
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Why do some people have a fear of depths?

I'm asking this question on this website because I want an evolutionary reason rather than a reason of how the human brain works. In one episode of "The Nature of Things," I heard David Suzuki say he ...
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255 views

Is happiness or pleasure an evolutionary programming for survival?

I think that whenever we feel some kind of happiness or pleasure it is always related with improving our chances of survival, that might be temporarily or in long term, might be of only of an ...
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43 views

Carbohydrate diet and dental health

I read that human started carbohydrates rich diet after adopting agriculture before that meat was main energy source which has comparatively less carbohydrate. High carbohydrate started destroying ...
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527 views

Is natural selection still at work in humans in the 21st century? [duplicate]

There has been some disussion on this site about some aspects (e.g. evolution of eye sight, or height, or the effect of medicine, or evolution the past $\sim10000$ years). My question is really more ...
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95 views

Why do human have continuously-growing hair on their head? [duplicate]

Why do hair continuously grow on human heads, while the same doesn't happen on other parts of the human body? Where there are hair, they only usually grow to a fixed length; but they seem to have no ...
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Why do many humans, including myself, find cats so cute? [closed]

After all, they are descendants of big, dangerous lions and other wild cats, which doubtlessly have eaten many humans in the past, and probably continue to do so in some places even today. Yet we for ...
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What makes red meat less healthy than seafood, after millennia of evolving to eat meat? [closed]

We are told that red meat is carcinogen; fish and white meat are not. What make us not "compatible" to red meat after thousands of years of evolution and meat eating, and yet seafood is opposite ?
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111 views

Genetic entropy [closed]

One day my internet acquaintance told me, that genetic entropy can be evidence in favor of intelligent design and he also provides me this waiting time problem and this simulating evolution by gene ...
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Does technological developments terminate the evolution of human species? [duplicate]

One of the most agreed upon mechanism for evolution is natural selection.Changing environmental conditions necessities development of variations that enable the survival of that particular species....
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78 views

Why has reproduction evolved as a choice? [closed]

From an evolutionary perspective, the purpose of an organism is to pass along its genes through reproduction. However, as humans we have a choice if we want to reproduce or not. The good feeling from ...
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77 views

How big advantage had a trait have to bring to evolve in the human evolution? [closed]

Yes, I've heard that we have evolved from the common ancestor with primates as intesively, as the chimpanzees. Sometimes I read about some enormously complex traits, evolutionary psychologists think ...
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Can there be significant new changes in physical features of Humans due to evolution in 10000 years of span? [duplicate]

Humans migrated from Africa about 60000 years. And in these years humans physical features undergone significantly in terms of skin color, hair, eye color and facial features. So, with this we can ...
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50 views

Is there a name for survival of the fittest in a single family? [closed]

Imagine a case where the children of a bird each have a 50% chance of being born blind. But the bird always has on average 4 chicks. So on average 2 will be blind and 2 sighted. (Perhaps this could ...
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110 views

Evolution versus Creationism [closed]

If nature, or any aspects of it, are intelligently designed, how could we tell? How would we be able to test that hypothesis?
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Can the environment affect genes and adaptation in offspring?

I recently read several articles that believe that environment can affect gene expression and this change will transfer down to the children. Some theorists believe that random mutations are more rare ...
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70 views

single use traits

Are there any known traits (in any organisms) that serve exclusively one purpose? (Counterexample: Giraffes long neck help them reach less available food AND communicate sub-sonically). If so is ...
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Is cruelty a human instinct? [closed]

I had started studying human behaviour and human instincts a few months ago, earlier the question was raised after seeing human behaviour with animals (his prey). Animals hunt their prey for eating, ...
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1answer
96 views

Are women smaller to optimize cloth needs during pregnancy? [closed]

Current life events made me wonder: Is it possible that female humans evolved to be on average smaller than males, so that they can reuse their partner's cloth during pregnancy? At least in my ...
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73 views

Does natural selection in humans work out in “best outcomes” or do e.g. subjective biases affect it?

Does natural selection in humans work out in "best outcomes" or do subjective biases affect it? That is, how much is natural selection "guided by nature" and "guided by humans"? E.g. given "fully ...
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160 views

Why hasn't evolution gotten rid of the appendix yet?

A figure I have recently stumbled upon suggests that about 7% of the world population will, or have, had appendicitis in their lifetime. Cutting out the appendix was impossible until very recently. ...
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Why are human immune systems comparatively weaker than other animal immune systems? [closed]

Humans get sick on such a regular basis and animals will hardly ever get sick. Animals are typically exposed to the same pathogens as humans, yet a dog won't have a cold or the flu twice a year, with ...
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Isn't it an evolutionary disadvantage to have a single organ perform so many essential functions?

This is in reference to the human liver, responsible for not only the production of bile, but also the filtration of blood, metabolization of drugs, detoxification and so on. Liver failure is often ...
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270 views

Sex and human's sexual urge.

Why is it necessary for humans to feel pleasure while having sex? Why is it that other animals don't need to experience it? Is it evolutionary ? Why do we mate for pleasure when it's so energy wasting/...
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Why do humans have flat faces, as compared to chimps?

Apparently adult, particularly older human faces resemble infantile chimps more tham they resemble any other adult hominid. And adult humans even have as many body hair follicles as infantile chimps. ...
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100 views

Does SIV cause AIDS in primates… If not why [closed]

does SIV cause AIDS in primates or have they developed resistance to the virus **
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Are there different species of modern day humans? [duplicate]

I've been watching nature shows on Netflix (Wildest series) and different animals of the same "family" are actually different species. e.g. Asian elephants vs African elephants. Asian elephants are ...
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2answers
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quadrupedalism in human [closed]

Recently I saw a BBC documentary on a family from a remote village in turkey where one couple has 18 children and out of which 5 are walking on four legs. These children are 28-34 yr old & have ...
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2answers
683 views

Evolution of complex organs [duplicate]

If it evolved, how is a feature selected through a long time span with useless function before the feature becomes complete? For example, an eye is a very complex organ consisting of countless small ...
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1answer
76 views

Why do we develop addiction? [duplicate]

Recently, while on the train, I saw a person not holding the handrails on purpose. He decided that playing a game with no outcome whatsoever was more important than his safety. In fact, he bumped into ...
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1answer
93 views

Has human intelligence evolved as a costly male signal?

In this video at 42:06, Daniel Dennett posits that our big brains are: The human artifice or version of the peacock's tail. Peacocks have sexual dimorphism - it's males who exhibit the costly ...
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EVOLUTION OF MAN QUESTION [closed]

I have a few questions concerning man's origins . Man has 10 vital Organs and support systems. yes or no? Man needs all 10 of his vital Organs or he dies. yes or no? . Either those 10 vital organs ...

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