Linked Questions

6 votes
3 answers
2k views

Why do ostriches have wings? [duplicate]

Wings serve most birds for flying, or (as in penguins) for swimming. But ostriches, which exclusively use only their legs for locomotion, still have wings. Why?
George A. Solodun's user avatar
3 votes
2 answers
1k views

Why were wisdom teeth not eliminated by evolution? [duplicate]

Supposedly evolution was very efficient and evolved many human proteins over a few thousand generations. Yet obvious detrimental traits like wisdom teeth remained. Why?
Liu's user avatar
  • 31
0 votes
0 answers
2k views

Why do humans have 46 chromosomes? [duplicate]

Humans have approximately 25000 genes. Why are these genes on 46 chromosomes? Why not 40 or 50?
Ali Afaq's user avatar
5 votes
1 answer
427 views

Bacteria resistance to natural antibiotics? [duplicate]

It is a known fact that bacteria develop immunity to antibiotics. Why then did not all bacteria develop immunity to natural antibiotics like penicillin in the fungi? It is for sure that fungi did not ...
noncom's user avatar
  • 546
0 votes
2 answers
611 views

In men, why do over 80% of sperm have abnormal form? [duplicate]

Here is the percentage of normal forms among fertile mens according to the centile (Source: Cooper et al. 2010): 2.5: 3% 5 (below this is Teratozoospermia): 4% 10: 5.5% 25: 9% 50 (median): 15% 75: ...
Aero's user avatar
  • 123
2 votes
1 answer
1k views

Why would pedophilia exist? [duplicate]

From an evolutionary perspective, why would anyone ever be sexually exited by small children who could not possibly have started puberty? Is it a confusion between some combination of sexual and non-...
Lorry Laurence mcLarry's user avatar
-2 votes
4 answers
270 views

Why doesn't evolution converge on perfection? [duplicate]

I got to know about an organism called "Tardigrade(water bear)" which is an extremely hardy organism and can survive in most conditions. My question is that if the aim of life in general is to ...
neel g's user avatar
  • 149
0 votes
1 answer
364 views

Why don't intelligent animals like primates use plastic bags? [duplicate]

I'll be honest here. Although this is a serious question, what made me wonder about it is this comic from Wumo: This question is not specific to monkeys. It applies to animals that live with or ...
Nav's user avatar
  • 573
0 votes
2 answers
447 views

What evolutionary advantage do separate teeth have compared to a single piece of bone? [duplicate]

Humans and many animals have multiple teeth consisting of separate pieces of bone embedded in the jaw. For humans, this arrangement has some disadvantages: teeth are quite fragile when impacted and ...
Lukas_Skywalker's user avatar
-1 votes
1 answer
293 views

Why humans didn't evolve to safely consume rotten food? [duplicate]

I'm not a biology person at all so please forgive me if my question is silly. I was just wondering that why didn't evolution cause us to digest, without issues decomposed food?
Kashmiri's user avatar
  • 211
2 votes
1 answer
266 views

If a trait does not appear to be advantageous to organism, why does the organism have it? [duplicate]

Why do organisms have some traits that do not appear to have any evolutionary advantage?
C_Z_'s user avatar
  • 2,485
1 vote
1 answer
293 views

What is the biological/evolutionary advantage to baldness? [duplicate]

Male pattern baldness is a common genetic trait. With a distinctive pattern/ density gradent (as apposed to general old age thinning as the body ages) Hair has an advantage of protection from the sun/...
DarcyThomas's user avatar
1 vote
1 answer
1k views

Why don’t humans have eyes at the back of their heads? [duplicate]

How does evolution rule out the possibility of humans or others fragile herbivores from having 2 pairs of eyes, one at the front and the other at the back of their heads? Why didn’t that ever happen?
RedHelmet's user avatar
  • 111
2 votes
1 answer
177 views

Why are there still useless traits/mutations in our body [duplicate]

Why is it that through decades of evolution , some seemingly useless body traits such as earlobes and pubic/chest hair still remains while other traits are generally replaced through evolution?
Jfjdkksjsjk's user avatar
1 vote
1 answer
129 views

How did evolution support sports, fun, entertainment etc [duplicate]

We know that many animals entertain themselves by playing games. But sports actually increases risks of death,or at least accidents. So why did evolution choose it? And why did evolution decide to ...
Bob's user avatar
  • 29
0 votes
0 answers
128 views

Is there an evolutionary advantage associated with migraine? [duplicate]

I have read Wikipedia article on Genetics of migraine headaches and I don't buy it Because genetics influence susceptibility to migraine, it can be shaped by evolution. Fitness-impairing ...
Matas Vaitkevicius's user avatar
3 votes
0 answers
94 views

What is the advantage of being tired after having a sex? [duplicate]

When we have a sex with partner, we feel so tired that we don't have any power to do anything. Then it would be disadvantage to the animals, of course humans too, for they are exposed to danger. For ...
Sean's user avatar
  • 31
1 vote
0 answers
71 views

Why are there no WINGED flying arachnids? [duplicate]

There seem to have been no arachnids flying WITH WINGS of any sort at any location or any time in the present or in the fossil record. Why is this? Rationale for question : If the process of ...
RogueBean's user avatar
0 votes
0 answers
67 views

Why did the dinosaurs not have gigantic brains and become really smart? [duplicate]

All my life, I've heard that all these gigantic dinosaurs that used to live on Earth had peanut-sized brains. I just accepted this as a fact, and I guess it may be a fact. But now I wonder: why?! If ...
Z. B.'s user avatar
  • 21
0 votes
1 answer
65 views

Why haven't environmentally-reactive bodies developed as an evolutionary advantage? [duplicate]

Regardless of region, earth's tilt results in yearly seasonal changes, which organisms deal with through processes like migration/hibernation. Both seem like attempts to avoid the extreme fluctuations....
Taytee13's user avatar
1 vote
0 answers
57 views

Confused About Why Red Queen Hypothesis Wouldn't Apply to Deer's Color Vision [duplicate]

In this site,https://www.livescience.com/why-are-tigers-orange, it says ""But there seems to be no evolutionary pressure, particularly for deer, which are the main prey of the tiger, to ...
MeltedStatementRecognizing's user avatar
1 vote
0 answers
47 views

Evolutionary advantage of the nutrient played by the chicken [duplicate]

What is the evolutionary advantage of the chicken throwing out so much nutrient ovulating all the time? Is there a clear advantage to this? Chickens ovulate all the time for the same reason human ...
Artures's user avatar
  • 11
1 vote
0 answers
36 views

Are there any biological obstacles prohibiting lighter-than-air organisms? [duplicate]

Why there are no organisms that use cavities filled with lighter-than air substances (e.g. hydrogen) to fly and remain in air? Given that there are a lot of fish and algae that use similar cavities ...
Anixx's user avatar
  • 3,016
0 votes
0 answers
31 views

Evolutionary explanation for hypoxia causing euphoria? [duplicate]

Why would something potentially very dangerous, such as hypoxia induce something pleasurable like euphoria? Are there any evolutionary hypotheses for this link? I'm thinking that something like the "...
got trolled too much this week's user avatar
0 votes
0 answers
31 views

What are evolutionary reasons for humans' limited regeneration abilities? [duplicate]

As far as I understand (I am not a biologist), a ability of a species arises during the evolution if: It increases reproduction chances It is not too energy expensive It is physically possible At ...
kandi's user avatar
  • 109
0 votes
0 answers
23 views

Are the 5 digits of all land vertebrates an accidental number? [duplicate]

All land verterbrates except some frogs have 5 fingers on hands and feet. The first vertebrate lizards came out of the water and had 7 fingers ( -370mn yrs), and then 6 fingers, and after 30 million ...
bandybabboon's user avatar
  • 10.4k
0 votes
0 answers
17 views

What prevented invertebrates from discovering flight a second time? [duplicate]

Vertebrates evolved powered flight three times in history, being pterosaurs, birds, and finally, bats. Invertebrates were the first to evolve flight on the planet... but flying insects remained the ...
Darth Biomech's user avatar
-1 votes
0 answers
8 views

Why some receptors have such high activation ceilings? [duplicate]

Why does the brain have receptors that have such a high activation celling, that no endogenous neurotransmitter could even come close to fully activate? Which ultimately results in there being certain ...
Antony Theo.'s user avatar
33 votes
7 answers
13k views

Is evolution a fact? [closed]

Richard Dawkins in one of his videos says that Evolution is a fact and not just a theory. He goes on to say that man and chimpanzees both evolve from apes. Is this correct (Is evolution a fact and ...
Farhan stands with Palestine's user avatar
42 votes
6 answers
11k views

If evolution is not about increased complexity, why does so much complexity evolve?

In my last question I asked why we don't see increased complexity in artificial life simulations of evolution. It seems I had fallen for a common misconception, that evolution was about improvement by ...
vonjd's user avatar
  • 1,061
54 votes
4 answers
10k views

Why do men have nipples?

I'd be tempted to call nipples in men vestigial, but that suggests they have no modern function. They do have a function, of course, but only in women. So why do men (and all male mammals) have them?
Shep's user avatar
  • 2,515
42 votes
5 answers
6k views

Why did life not evolve to use radio?

We use electromagnetic communication everywhere these days. Cell phones, wifi, old-school radio transmissions, television, deep space communication, etc. I'm curious about some of the possible ...
Geuis's user avatar
  • 531
45 votes
3 answers
14k views

Are humans more adapted to "light mode" or "dark mode"?

I was discussing with a colleague about using dark-mode vs. light mode and remembered an article arguing that humans vision is more adapted to light-mode rather than dark-mode: I know that the trend “...
Alexei's user avatar
  • 1,675
27 votes
3 answers
12k views

Why haven't prey evolved the ability to always outrun their predators?

I can understand why some prey can't outrun a recently evolved species. However, since cheetahs have existed for so long, why haven't its prey evolved to always outrun it, driving cheetahs to ...
Timothy's user avatar
  • 886
16 votes
5 answers
2k views

Why have parasites not evolved to be harmless?

I have yet to understand why so many viruses or bacteria haven't evolved to be harmless (specifically, I don't know of any harmless viruses). I think it would be greatly beneficial for a virus to ...
chubakueno's user avatar
11 votes
2 answers
12k views

Why do adult insects have 6 legs?

Apparently, there is an advantage to having 6 legs in the insect world. What is that advantage, if anything? Why would such an advantage exist for insects, but not for other, larger land animals? ...
DrZ214's user avatar
  • 1,421
15 votes
2 answers
996 views

Evolution in 37 years, is it possible?

I am confused, can evolution ( speciation ) really occur in such a short time ? In 1971, biologists moved five adult pairs of Italian wall lizards from their home island of Pod Kopiste, in the ...
Özgür's user avatar
  • 561
8 votes
3 answers
9k views

Why are lions the only social cats?

We know that almost all cats are solitary. How did the Lions (Panthera leo) end up social animals? Do we have an explanatory evolutionary path describing how the Lions became social while the rest of ...
mousomer's user avatar
  • 181
4 votes
4 answers
6k views

Is our genome decaying (see "Genetic Entropy"), and, if so, is this evidence for our genome being "young"?

In the book Genetic Entropy & the Mystery of the Genome the author says that the genome cannot be old because the genome is "decaying". Decay is a very subjective term, but in this case he means ...
Lucian09474's user avatar
16 votes
1 answer
2k views

If plants "alternate generations" between sporophytes and gametophytes, why don't we say the same of humans?

I've been reading on Wikipedia about how plants alternate generations between a diploid sporophyte (usually the dominant part) and haploid gametophyte (in flowering plants, the pollen and ovule sacs). ...
Max's user avatar
  • 285
8 votes
2 answers
9k views

Why can't we grow more teeth?

A similar question but about teeth healing themselves is Do teeth have the capacity to heal?. So I understand that teeth have the capacity to heal themselves to a certain degree. It appears to be ...
TheLethalConstant's user avatar
10 votes
3 answers
2k views

Genetic Diversity and Adaptation

I am somewhat new to evolutionary biology, having studied it on my free time as a computer science student. There is one particular thing that has always bothered me for which I have not seen a good ...
mellamokb's user avatar
  • 203
7 votes
1 answer
11k views

What is the standing genetic variation?

I am reading this review. In the first part, the author introduces Standing Genetic Variation, described as: STANDING GENETIC VARIATION Allelic variation that is currently segregating within a ...
gc5's user avatar
  • 820
1 vote
2 answers
697 views

Why does 360 degree rotation not seemed to ever have evolved?

Of the designs of species that have evolved, I am curious why a 360 degree rotation, like a joint that can spin, does not seem to have evolved, for example wheels or a propeller. Like, is there some ...
Julius Hamilton's user avatar
10 votes
1 answer
1k views

Why are venomous mammals and birds so rare in comparison to reptiles and fish? [closed]

Why are venomous mammals and birds so rare in comparison to reptiles and fish? Metabolic reasons? Morphology? Selection pressures? Why are not all reptiles venomous but many are? Why are platypuses ...
li tchi.'s user avatar
  • 129
8 votes
3 answers
3k views

why has evolution favored sexual reproduction using two mates over sexual reproduction using three mates?

Many animals species require two members — a male and a female — to sexually reproduce. Why has nature (or the process of evolution) chosen to favor the form of sexual reproduction which requires two ...
Yashas's user avatar
  • 261
3 votes
1 answer
5k views

Why do nerve cells convert electric signals to chemical signals?

One would assume that a faster response time in the nervous system would be beneficial. However, nerve cells have to convert electrical impulses to chemical signals and cross a synapse. Why didn't ...
rainwaffles's user avatar
3 votes
1 answer
8k views

What is the point of a runny nose during a cold?

What is the biological purpose of having a runny nose during a cold? Note, this is a different question than "What causes a runny nose" and other similar questions. Those question are about the cause,...
gman's user avatar
  • 149
7 votes
2 answers
1k views

Why do fruit flies go so close to large reservoirs of liquid when they are likely to fall in due to surface tension?

I had accidentally left out half a glass of red wine by the windowsill when I went to sleep. As anyone knows, if you do this with a window cracked you will get quite a few fruit flies near it in that ...
hisairnessag3's user avatar
5 votes
2 answers
491 views

Do Traits Have to be Adaptive in Order to Survive?

I'm reading Michael Pollan's book 'How to Change Your Mind', which is largely about psychedelic mushrooms. In discussing the biology of the mushrooms, he writes: 'Even if psilocybin in mushrooms ...
nothingIsMere's user avatar

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